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Posted: 11/17/2016 10:31:06 AM EST
[#1]
Quote HistoryQuoted:
The Sistine Cafeteria...  Quote HistoryQuoted:
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The idea of black ceiling tiles is not bad at all. I'm not sure I'm willing to risk my life bringing that idea up to the custodian.
Painting the ceiling tiles I think is ok, as even the Army Recruiter gets away with that in his building. As for the blanket seams, yes, they look really rough  . Once we get to the airbrushing, we will see if we can camo them up a bit using a hard edge.The Sistine Cafeteria... Ouch! Way too pricey.  So can we paint them without the fire marshal freaking out? Custodian is going for sainthood before retirement, and is on board with pulling down all 58 to be painted black with stars.
Custodian sent me this link. http://www.homedepot.com/p/Genesis-2-ft-x-4-ft-Stucco-Pro-Black-Ceiling-Tile-765-07/203397618?cm_mmc=Shopping%7cTHD%7cG%7c0%7cG-BASE-PLA-D23-Ceilings%7c&gclid=CIW7l_OHsNACFdgPgQodGoQD7Q&gclsrc=aw.ds |
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Posted: 11/17/2016 5:22:53 PM EST
[#2]
Math is an unforgiving bitch.
That is all. |
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Posted: 11/17/2016 6:34:14 PM EST
[#3]
Quote HistoryQuoted:
Math is an unforgiving bitch.
That is all. Wiseass Student 1: "Measure twice, cut once." Wiseass Student 2: "Measure twice, cut once." Wiseass Student 3: "Measure twice, cut once." guns762: "Knock it off, you little hooligans, or I swear, we're going to redo those wing tiles!" 
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Posted: 11/17/2016 6:39:03 PM EST
[#4]
Update 11/17
Still working on paint possibilities for ceiling tiles. We played around with tiles on the nose today. First we tried getting some black paint down for those concerned folks.
It does seem to look good.
Then we started tiles. Math sucks. 
This didn't work.
After measuring the circumference in several places, and doing some math, students cut these. 
Going on. 
After a few rows. This works as long as students don't try and take short cuts. Agajn.....math is unforgiving. 
We also found a couple ports we missed, and started laying out those. |
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Posted: 11/17/2016 6:42:16 PM EST
[#5]
Quote HistoryQuoted:
Wiseass Student 1: "Measure twice, cut once." Wiseass Student 2: "Measure twice, cut once." Wiseass Student 3: "Measure twice, cut once." guns762: "Knock it off, you little hooligans, or I swear, we're going to redo those wing tiles!" Quote HistoryQuoted:
Quoted:
Math is an unforgiving bitch.
That is all. Wiseass Student 1: "Measure twice, cut once." Wiseass Student 2: "Measure twice, cut once." Wiseass Student 3: "Measure twice, cut once." guns762: "Knock it off, you little hooligans, or I swear, we're going to redo those wing tiles!" 
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Posted: 11/17/2016 6:50:01 PM EST
[#6]
I like the tile storage ports in the nose.
You may need to have the students paint the tiles after they cut them so we don't see the white edges. 
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Posted: 11/17/2016 7:53:11 PM EST
[#7]
.
About those ceiling tiles... The person you have to satisfy is the area fire marshal. I know that it is contrary to our independent tendencies, but why not simply ask him for advice and guidance on the ceiling tile issue? Maybe there is an approved paint or other color coating? Then once he approves whatever you decide to do about those 58 tiles, he gives you a letter to the effect that whatever you do to the ceiling meets fire control standards.Or is not in violation of fire safety standards. Whichever. |
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Posted: 11/17/2016 8:11:42 PM EST
[#8]
Quote HistoryQuoted:
. About those ceiling tiles... The person you have to satisfy is the area fire marshal. I know that it is contrary to our independent tendencies, but why not simply ask him for advice and guidance on the ceiling tile issue? Maybe there is an approved paint or other color coating? Then once he approves whatever you decide to do about those 58 tiles, he gives you a letter to the effect that whatever you do to the ceiling meets fire control standards.Or is not in violation of fire safety standards. Whichever. It's actually pretty amazing how things change from marshal to marshal. Each one seems to want things a little different. I just need to find out if there is something universally accepted. If not, it's probably not worth pursuing, as marshals seem to change quite frequently. |
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Posted: 11/17/2016 8:12:47 PM EST
[#9]
Quote HistoryQuoted:
I like the tile storage ports in the nose. You may need to have the students paint the tiles after they cut them so we don't see the white edges. Airbrush. ... 
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Posted: 11/17/2016 9:09:52 PM EST
[#10]
Quote HistoryQuoted:
After measuring the circumstances in several places, and doing some math, students cut these. Found your math problem. |
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Posted: 11/17/2016 9:24:01 PM EST
[#11]
Quote HistoryQuoted:
Found your math problem. Quote HistoryQuoted:
Quoted:
After measuring the circumstances in several places, and doing some math, students cut these. Found your math problem. .
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Posted: 11/17/2016 9:30:08 PM EST
[#12]
Are the windows glass so paint/glue/etc can be easily scraped off with a razor scraper? Head off the nightmare before it happens.
It's looking great, otherwise! $2k for ceiling tiles is a bit out of reach, so to speak. For the edges of the thermal blankets, can't you use some very narrow strips on some of them? I saw some bars across the blankies in the photo, but not as many as there are ridges... Is the burlap hard enough to smooth down a bit with a rasp? |
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Posted: 11/17/2016 9:53:17 PM EST
[#13]
Quote HistoryQuoted:
Are the windows glass so paint/glue/etc can be easily scraped off with a razor scraper? Head off the nightmare before it happens. It's looking great, otherwise! $2k for ceiling tiles is a bit out of reach, so to speak. For the edges of the thermal blankets, can't you use some very narrow strips on some of them? I saw some bars across the blankies in the photo, but not as many as there are ridges... Is the burlap hard enough to smooth down a bit with a rasp? Good idea on the windows. Ill, see about getting them covered. We've been able to cut some high spots down with knives. The burlap is pretty hard. We might try a rasp. Might work. 
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Posted: 11/18/2016 11:32:26 AM EST
[#14]
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We've been able to cut some high spots down with knives. The burlap is pretty hard. We might try a rasp. Might work. Dremel FTW! |
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Posted: 11/18/2016 12:39:26 PM EST
[#15]
Quote HistoryQuoted: Dremel FTW! Quote HistoryQuoted: Quoted: We've been able to cut some high spots down with knives. The burlap is pretty hard. We might try a rasp. Might work. Dremel FTW! |
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Posted: 11/18/2016 1:02:45 PM EST
[#16]
Quote HistoryQuoted:
Update 11/17 https://c8.staticflickr.com/6/5660/30954442751_a1528d1dbd_h.jpg We also found a couple ports we missed, and started laying out those. The drawn in circles fwd of the 2 down firing thrusters? Those are the down firing vernier thrusters. Each OMS pod has a side firing vernier thruster as well, they are the 5th hole or most aft hole behind the side firing thrusters, about 3" diameter. Used for very minor orientation corrections. |
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Posted: 11/18/2016 8:22:52 PM EST
[#17]
Quote HistoryQuoted:
The drawn in circles fwd of the 2 down firing thrusters? Those are the down firing vernier thrusters. Each OMS pod has a side firing vernier thruster as well, they are the 5th hole or most aft hole behind the side firing thrusters, about 3" diameter. Used for very minor orientation corrections. Quote HistoryQuoted:
Quoted:
Update 11/17 https://c8.staticflickr.com/6/5660/30954442751_a1528d1dbd_h.jpg We also found a couple ports we missed, and started laying out those. The drawn in circles fwd of the 2 down firing thrusters? Those are the down firing vernier thrusters. Each OMS pod has a side firing vernier thruster as well, they are the 5th hole or most aft hole behind the side firing thrusters, about 3" diameter. Used for very minor orientation corrections. Thank you, we found the aft ones too today.
Hopefully Monday we can get them mapped out. |
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Posted: 11/18/2016 8:24:18 PM EST
[#18]
Quote HistoryQuoted:
I bet a power sander with 60 grit paper would work too. Quote HistoryQuoted:
Quoted:
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We've been able to cut some high spots down with knives. The burlap is pretty hard. We might try a rasp. Might work. Dremel FTW! You fellas are trying to get me fired.
The rasp worked well. It was loud as hell though. Sounded like sanding on a large drum. 
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Posted: 11/18/2016 9:37:48 PM EST
[#19]
Update 11/18
Space Cowboys didn't show, and still isn't here.
So no movie today. 
That meant work got done on the shuttle.
The rasps worked well. Good suggestion. Kids ground down the high and rough points, then we repainted. It made a good difference. Just starting. We made a ton of noise with these as it was like sanding a lage drum. Don't think I made friends with other teachers today.
Very little room today around the shuttle. Students were working hard to find space to get their job done. 
Couldn't be prouder of this guy  . He was there at 7am, worked during lunch, and managed to get out of three classes to work about 5hrs during regular classes today. He never gave up, even when I was badgering him to redo rows of tiles, again and again. He didn't quit, and got the complicated tiling done on the nose. The amount of time this guy has put into this project so far this semester is mind boggling.
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Posted: 11/18/2016 11:31:30 PM EST
[#20]
That looks really good after the bit of cleanup! You must have some strong glue for burlap to make that much noise.
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Posted: 11/19/2016 8:46:38 AM EST
[#21]
Quote HistoryQuoted:
That looks really good after the bit of cleanup! You must have some strong glue for burlap to make that much noise.
I should have snapped a pic of the bay door after repainting. It looks pretty good.
The hide paste plus the burlap is dang near fiberglass and resin strength, but with a bit of give. I was kind of shocked how much they could shave off and still not fray the burlap. Large bumps simply disappeared. It also cleans up with water, as long as it's not dry. Pretty good glue. |
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Posted: 11/19/2016 8:51:08 PM EST
[#22]
Quote HistoryQuoted:
Update 11/18 Space Cowboys didn't show, and still isn't here.
So no movie today.
That meant work got done on the shuttle.
The rasps worked well. Good suggestion. Kids ground down the high and rough points, then we repainted. It made a good difference. Just starting. We made a ton of noise with these as it was like sanding a lage drum. Don't think I made friends with other teachers today.
https://c6.staticflickr.com/6/5588/30987126981_ebd739c674_h.jpg https://c1.staticflickr.com/6/5717/30733830640_6fa740c913_h.jpg Very little room today around the shuttle. Students were working hard to find space to get their job done. https://c8.staticflickr.com/6/5752/31100662975_e60ae2214a_h.jpg https://c5.staticflickr.com/6/5580/31064902316_405a682d12_h.jpg Couldn't be prouder of this guy . He was there at 7am, worked during lunch, and managed to get out of three classes to work about 5hrs during regular classes today. He never gave up, even when I was badgering him to redo rows of tiles, again and again. He didn't quit, and got the complicated tiling done on the nose. The amount of time this guy has put into this project so far this semester is mind boggling.
https://c1.staticflickr.com/6/5504/30958480712_d3687c2841_h.jpg Glad to hear good work ethic is still found in the youth of our country! Hopefully this will help reinforce that in others as well. |
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Posted: 11/20/2016 10:50:14 PM EST
[#23]
Quote HistoryQuoted: The hide paste plus the burlap is dang near fiberglass and resin strength, but with a bit of give. I was kind of shocked how much they could shave off and still not fray the burlap. Large bumps simply disappeared.
It also cleans up with water, as long as it's not dry. Pretty good glue. Ya' don't say... http://www.ar15.com/forums/t_3_4/676733_Fruity_Ghost___DIY_100s_of_ARs_cheaper__faster__gentler_.html |
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Posted: 11/21/2016 7:29:48 AM EST
[#24]
Quote HistoryQuote HistoryQuoted:
Quoted: The hide paste plus the burlap is dang near fiberglass and resin strength, but with a bit of give. I was kind of shocked how much they could shave off and still not fray the burlap. Large bumps simply disappeared.
It also cleans up with water, as long as it's not dry. Pretty good glue. Ya' don't say... http://www.ar15.com/forums/t_3_4/676733_Fruity_Ghost___DIY_100s_of_ARs_cheaper__faster__gentler_.html 
That's pretty neat. No movie today.
UPS failed. Won't be here till tonight. So much for Prime 2 day shipping.  I searched three walmarts, bestbuy, target, hastings, shopco, and Costo on Sat. for a copy. My beautiful wife helped me dig through the $5 bins trying to find one.
Sad thing is, it's free to stream on Vudu right now, and I can't do it in the classroom as the projector or website is set up to block any steaming from sites like Vudu. 
ETA: We got the free version streaming. It was the monitor splitter that was causing the website to "snowball" the projector. Tech guys got down here and helped me set it up so we could start the movie. That means not a whole lot will get done the next couple days. Sorry.
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Posted: 11/21/2016 7:27:27 PM EST
[#25]
Update 11/21
Movie got started, but we still got a little work done. Notice the new ports on the side, as well as a little paint for under the tiles. 
A better view of the blankets after being smoothed out along the cargo bay doors. 
Almost ready for tiles around the glass. 
One of the bells getting more details, but we probably need more references. 
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Posted: 11/21/2016 9:00:31 PM EST
[#26]
Quote HistoryQuoted:
One of the bells getting more details, but we probably need more references. https://c2.staticflickr.com/6/5561/31051635481_60f1a046b7_h.jpg In case it helps: 
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Posted: 11/21/2016 9:52:09 PM EST
[#27]
Quote HistoryQuote HistoryQuoted:
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One of the bells getting more details, but we probably need more references. https://c2.staticflickr.com/6/5561/31051635481_60f1a046b7_h.jpg In case it helps: http://i.imgur.com/0nkECLN.jpg Yep, that will help.
Fun thing about "Space Cowboys"--- After watching the first 50min twice today, I had to watch the end tonight when I got home. . As much fun as the movie is, I was surprised by home much shuttle time is in the movie, and not just the basic ship going through space. I noticed some great up close shots of the bells in the research bay at "NASA".
Also, decent segments talking about the OMEs and showing them maneuvering the shuttle in space. It will be fun for the kids to see the different systems they are building being featured in the film. The escape hatch being opened before landing; not sure how realistic that was, but it was still neat to see it opening. The tiles, as well as the wing edges heating up are shown on reentry too. The top canopy windows also play a significant role in the film. I even saw the blankets in a couple scenes. I'm sure many scenes bring out serious eye roles by those in the know, but there seems to be plenty of good scenery of the shuttle. The reentry scene will be interesting to discuss with students after ward, given Columbia's break up, only 3yrs after this film was made. 
Just an all around great movie for discussion, given our project. |
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Posted: 11/21/2016 10:14:16 PM EST
[#28]
I'll have to check the movie out again. I haven't seen it since Columbia, and I don't remember much about when I did see it except them bailing out at the end with the curved bar out the hatch or something.
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Posted: 11/21/2016 10:20:27 PM EST
[#29]
Quote HistoryQuoted:
I'll have to check the movie out again. I haven't seen it since Columbia, and I don't remember much about when I did see it except them bailing out at the end with the curved bar out the hatch or something. They chuck the young guys, who are unconscious, out the hatch . The old guys take the ship in on manual.
The whole scene with the damage from debris, the reentry with the glowing tiles, and even "over Texas" was pretty damn close to Columbia's situation. It's spooky being so close even in date to the real disaster. I kept thinking......yeah, in the movies they make it home with all those probelms, but in real life, just that little damage doomed the crew and ship.
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Posted: 11/22/2016 9:43:04 AM EST
[#30]
Some reference photos for you:
.jpg)
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Posted: 11/22/2016 12:35:10 PM EST
[#31]
Those are amazing pics.
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Posted: 11/22/2016 1:06:12 PM EST
[#32]
Quote HistoryQuoted:
Those are amazing pics. At 500,000 lbs of thrust each and operational temperature range of below -400°F to 3,000°F they're amazing pieces of engineering. I really, really miss watching the live gimbal test at just inside T-4:00 and them lighting off at T-00:6.6. I'd rearrange my schedule just to make sure I caught every launch live. |
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Posted: 11/22/2016 1:19:11 PM EST
[#33]
Quote HistoryQuoted:
Some reference photos for you: https://upload.wikimedia.org/wikipedia/commons/b/b3/Space_Shuttle_Main_Engine_(SSME).jpg https://c2.staticflickr.com/6/5045/5643411308_e0bc6fd642_b.jpg http://www.aatransferinc.com/i/Smithsonian%20pictures%20031.jpg https://airandspace.si.edu/sites/default/files/images/24B97h.jpg http://www.cosmonautica.es/CN/SSME%20Motor%20principal%20Shuttle%20de%20prueba%20expuesto%20en%20el%20KSC.jpg http://communicatescience.com/zoonomian/wp-content/uploads/2013/01/IMG_0647a.jpg https://upload.wikimedia.org/wikipedia/commons/9/90/SSME1.jpg http://www.spd.org/images/blog/Shuttle-Layout-4R.jpg https://californiasciencecenter.org/sites/default/files/styles/meta/public/media/image/ssme-test-fire.jpg?itok=4pdZO3sA Those are perfect. The tail detail in one of them is also very much appreciated!!! |
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Posted: 11/22/2016 1:37:15 PM EST
[#34]
So, a glue gun sploded
 today and caught fire briefly.
That was exciting.
It was right next to the bear skin. It could have gone very badly.
Not sure why that happened. It was just sitting there, plugged in, and all of the sudden. POP!!! Flames and a little smoke. Nice burn mark on the table.
ETA pic 
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Posted: 11/22/2016 1:49:02 PM EST
[#35]
Quote HistoryQuoted:
Those are amazing pics. They really are. The striations inside the nozzles reminded me of something I read once and maybe some real rocket scientist can confirm. The main engine nozzles are made from brazing thousands of hollow tubes together. Then when the rockets are firing, the fuel (liquid oxygen and hydrogen) are pumped through those tubes before entering the combustion chamber. This keeps the nozzles from melting and brings the fuel up to temperature for a more efficient burn. Is this correct? |
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Posted: 11/22/2016 2:57:30 PM EST
[#36]
To answer your question, yes the Hydrogen flows through cooling pipes, to cool the thruster bell, and also to increase the fuel temp for consumption.
This is from wiki, and demonstrates how incredibly inventive the builders of space equipment are/were.... Nozzle The engine's nozzle is 121 in (3.1 m) long with a diameter of 10.3 in (0.26 m) at its throat and 90.7 in (2.30 m) at its exit.[9] The nozzle is a bell-shaped extension bolted to the main combustion chamber, referred to as a de Laval nozzle. The RS-25 nozzle has an unusually large expansion ratio (about 77.5:1) for the chamber pressure. At sea level, a nozzle of this ratio would normally undergo flow separation of the jet from the nozzle, which would cause control difficulties and could even mechanically damage the vehicle. However, to aid the engine's operation Rocketdyne engineers varied the angle of the nozzle walls, reducing it near the exit. This raises the pressure just around the rim to an absolute pressure between 4.6 and 5.7 psi (32 and 39 kPa), and prevents flow separation. The inner part of the flow is at much lower pressure, around 2 psi (14 kPa) or less. The inner surface of each nozzle is cooled by liquid hydrogen flowing through brazed stainless steel tube wall coolant passages. On the Space Shuttle, a support ring welded to the forward end of the nozzle is the engine attach point to the orbiter-supplied heat shield. Thermal protection is necessary because of the exposure portions of the nozzles experience during the launch, ascent, on-orbit and entry phases of a mission. The insulation consists of four layers of metallic batting covered with a metallic foil and screening. |
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Posted: 11/22/2016 3:07:58 PM EST
[#37]
Fantastic video of the engines in slow motion, at launch. I've only watched the first 10 minutes so far.
 "Best of the Best" Provides New Views, Commentary of Shuttle Launches |
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Posted: 11/22/2016 7:16:48 PM EST
[#38]
Update 11/22
Mounting plate for the SSMEs This allows us to slip the engine over the circle, then glue it at the angle that it needs to be at. 
We put the wing back on, along with the tail for the vacation, as many staff bring their families by the school for a tour of the projects. 
Few new tile lines forming on the top of the wing 
The robotics is struggling with the hinge opening mechanism. The original actuator design will not work because of the axis of the hinges. We are now considering a worm gear, and falling back to a simple cable/pulley system if all else fails, but that will only open the doors half way, on gravity.
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Posted: 11/22/2016 7:24:19 PM EST
[#39]
You should stop involving other classes. They seem to be your weakest link.
I would expect other teachers would want to share in the greatness of your projects. Surprised they aren't more involved. If I were the robotics teacher, you would have men in spacesuits flying around the shuttle on the robotic arm, repairing the Hubble. |
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Posted: 11/22/2016 8:27:36 PM EST
[#40]
Quote HistoryQuoted:
You should stop involving other classes. They seem to be your weakest link. I would expect other teachers would want to share in the greatness of your projects. Surprised they aren't more involved. If I were the robotics teacher, you would have men in spacesuits flying around the shuttle on the robotic arm, repairing the Hubble. First, thanks for the video posted! Very cool!
As for the robotics, it was partially my fault, as my son(robotics student) and I thought the actuator design would work......ok, really, it was me.
I'm working with the robotics students independently, and I know nothing, so it's pretty dismal.
These kids won both the Montana and Wyoming state robotics championships last year, yes, both, so they are pretty smart. They just need better guidance, and I'm failing at that as I know nothing.
They've been pretty patient with me. Hopefully, they will come up with a working device. I can't really say more.
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Posted: 11/22/2016 9:09:57 PM EST
[#41]
Can you post a diagram/photo that shows where the hinge goes, and places where a motor, gearing, and connecting rods can be?
If "up through the middle of the bay" is an answer, I've got a few solutions in mind. Need info on shortest path of travel and approx weight, though. You just need a rotary -> linear reciprocating shaft with switches at open and closed. Reciprocating shaft can be made with half a gear in a two-gear slot channel, or like a crankshaft to a piston, and fancier ways. |
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Posted: 11/22/2016 9:29:57 PM EST
[#42]
Quote HistoryQuoted:
Can you post a diagram/photo that shows where the hinge goes, and places where a motor, gearing, and connecting rods can be? If "up through the middle of the bay" is an answer, I've got a few solutions in mind. Need info on shortest path of travel and approx weight, though. You just need a rotary -> linear reciprocating shaft with switches at open and closed. Reciprocating shaft can be made with half a gear in a two-gear slot channel, or like a crankshaft to a piston, and fancier ways. I'll probably have to draw something up, but here is the model of the actuator my son built. Envision, the cargo bay wall on the left, the door on the right. Unfortunately, with the hinge offset, it doesn't work with out there being some kind of track on the door. The idea right now is to have a worm drive part way up the cargo bay cockpit wall, and push the door open, and close. 
I'm failing at being able to draw on this photo, but we envision a connection, laterally, half way up the curve in the bay door, to the middle of the cockpit bay wall. 
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Posted: 11/22/2016 9:33:09 PM EST
[#43]
Quote HistoryQuoted:  |
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Posted: 11/22/2016 9:45:07 PM EST
[#44]
Quote HistoryQuote HistoryIf Sham Wow guy was a redneck........
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Posted: 11/23/2016 9:24:01 AM EST
[#45]
Here is the detailed answer to the cooling of the engines comment that was posted yesterday.
For those with ADHD, jump to 4:00.  The Cooling System of Space Shuttle's Jet Nozzle |
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Posted: 11/23/2016 9:53:36 AM EST
[#46]
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Fantastic video of the engines in slow motion, at launch. I've only watched the first 10 minutes so far. </iframe> Amazing video. Thanks for posting it Leisure. |
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Posted: 11/23/2016 10:06:09 AM EST
[#47]
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Amazing video. Thanks for posting it Leisure. Quote HistoryQuoted:
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Fantastic video of the engines in slow motion, at launch. I've only watched the first 10 minutes so far. </iframe> Amazing video. Thanks for posting it Leisure. Definitely good stuff to show my students. I just have to show it, getting around the schools firewall blocking youtube entirely. 
We may all be watching and listening to it from my phone.
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Posted: 11/23/2016 10:12:16 AM EST
[#48]
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Definitely good stuff to show my students. I just have to show it, getting around the schools firewall blocking youtube entirely.
We may all be watching and listening to it from my phone.
Quote HistoryQuoted:
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Fantastic video of the engines in slow motion, at launch. I've only watched the first 10 minutes so far. </iframe> Amazing video. Thanks for posting it Leisure. Definitely good stuff to show my students. I just have to show it, getting around the schools firewall blocking youtube entirely.
We may all be watching and listening to it from my phone.
I've never tried it on a YouTube video so large but it's worth giving it a shot: http://keepvid.com/. You input the URL of the YouTube video, KeepVid pulls it down, converts it to a format you select like MP4 or AVI, and allows you to save it as a file. Do it at home, stick it on a thumbstick . . . bada-bing bada-boom, problem solved. |
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Posted: 11/23/2016 10:32:03 AM EST
[#49]
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Fantastic video of the engines in slow motion, at launch. I've only watched the first 10 minutes so far. </iframe> About halfway through this, this morning. Stunning imagery. Definitely going to have to get the tech dept involved so I can show this to some of my classes.
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Posted: 11/23/2016 11:01:49 AM EST
[#50]
Amazing.
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