Michael Zappe
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May 8, 2015 21:59:25
May 28, 2015 18:52:13
Geoffrey Lee That is incredible. Gives me so much more respect for archers.
May 28, 2015 21:32:48 · Reply
A. Ron Carmichael This is MOSTLY correct. The failure to consider the lateral sliding of the bowstring OFF OF THE FINGERS, which determines which way the arrow is going to flex, and which way the back end of the arrow is going to MOVE, actually altering the initial trajectory (direction of travel) of the point of the arrow, is EVERYTHING about determining whether archer's paradox exists or not. With the compound bow demonstrated, the archer uses a mechanical release that completely ELIMINATES the lateral slide, thus at no point in the arrow release is the arrow aimed OFF of the target as it is when an archer is holding the string with fingers. The paradox is not that the arrow does not "hit" the riser, the paradox is that the arrow IS NEVER POINTED AT THE TARGET BY THE ARCHER WHEN AIMING through a sight. As far as "being smart enough to know which way the nodes are flexing so you can hit the aspirin, just move the archer back 4 feet, changing the distance so he (one of the world's most distinguished and excellent demonstration archers) has to completely readjust his aim. He can do it but it will take him some shots to home back in. THAT IS THE PARADOX: NOT THAT THE ARROW DOESN'T HIT THE RISER/BOW, BUT THAT THE ARROW SHOT IS STARTED OUT AIMED COMPLETELY TO THE SIDE OF THE TARGET, YET STRING SIDESLIP (from the fingertips) CAUSES IT TO BE POINTED DURING A FEW MILLISECONDS DIRECTLY AT THE TARGET. THAT is the paradox. That the shaft flexes in nodal behavior so that the nock and vanes avoid hitting the bow (which his large feathers do NOT do) is a function of TUNING, selecting the right spine as it relates to the archer's release technique, the weight of the bow, the point weight, even the nature of the limbs of the bow and the surface of the archer's finger tab.
May 30, 2015 02:38:23 · Reply
Smarter Every Day At 2:45 Byron says "The first thing that happens is the arrow bends from the pressure of the string". He shows a lateral motion while explaining this.
June 1, 2015 03:42:04 · Reply
A. Ron Carmichael oops, sorry - I just noticed, I am citation (9) in the wiki references he posted, which refers to something I first posted on a website I maintain, in 2001. http://www.texasarchery.org for more info (and hundreds of photo examples of archers' releases). Highspeed video examples on the TSAA facebook page as well, I think... 600fps and 1200fps examples. Ron
May 30, 2015 02:50:32 · Reply
Rikkitikki Tavicat (Rikki Simons and Tavisha)
June 1, 2015 06:59:00
June 3, 2015 17:42:52
John Markus Add this to your site: document.getElementsByTagName('iframe')[0].src+='&autoplay=1';document.getElementsByTagName('iframe')[1].src+='&autoplay=1'; If you have the video already preloaded once, it should sync.
June 5, 2015 00:26:23 · Reply
Adam Ingle Amazing presentation! The Scientific Method CAN work on YouTube! HA!
June 12, 2015 17:08:07 · Reply
Tibor Schiemann Guys, I know my comment is a bit late, but this rocked! Just the idea of producing two perfectly synced videos from both hemispheres is awesome, not even mentioning the perfect execution or fun you always manage to convey to your audience. I'm glad I'm supporting you - keep up the great work!
June 19, 2015 10:46:55 · Reply
June 27, 2015 15:36:03
June 30, 2015 00:43:38
July 1, 2015 04:50:57
Maarten Daalder What is also amazing is that the Dragon capsule was sending telemetry after the breakup. It was suggested that if it had been the manned Dragon 2 capsule on top of the Falcon the humans inside could have opened the parachute and survive the explosion.
July 1, 2015 16:39:09 · Reply
Adam Ingle Fantastic video and insight, Destin. Thank you!
July 2, 2015 16:43:57 · Reply
Rikkitikki Tavicat (Rikki Simons and Tavisha)
July 1, 2015 06:59:00
July 15, 2015 02:21:52
July 21, 2015 05:39:59
Robert Deliën I just LOVED this video, Ben! I've been looking for a Stirling-cycle cryocooler on eBay since Jeri's video, but was unable to find one for a reasonable price. There's one on eBay now for $1500, but it's 12 years old and untested. How did you get the controller software? Keep up the good work!
July 25, 2015 17:33:35 · Reply
Applied Science Thanks! It's true that the STI Superfilters have gone up in price -- perhaps because of my blog post talking about the cryocooler within each unit. When I built my LN2 generator in 2008, the eBay price for the Superfilter was about $300. I got the software by calling STI and asking for it, but I didn't disclose the fact that I was a hobbyist.
July 25, 2015 17:50:52 · Reply
Jean-Francois Perreault Do you think it would possible for you to do a teardown of the cryocooler head ? Maybe including some measurements of critical parts ? There are quite a few DIY machinists on youtube and it might be possible to have the community make simplified cryocooler heads at a low cost ? Having LN2 on hand can be a great asset, especially if you generate your own it's probably cheaper than keeping dry ice in stock.
July 27, 2015 06:52:09 · Reply
Applied Science Jean-Francois, the cryocoooler is a sealed (welded) stainless steel unit, so a teardown would mean it will probably never function again. The teardown is not out of the question, but kind of a shame to destroy one, knowing how rare they are. The Stirling-cycle cryocoolers have some good technical documents and drawings on the web. This diagram is pretty detailed: http://www.ipaustralia.com.au/applicant/superconductor-technologies-inc/patents/AU2001274812/ Back when I was building the LN2 generator, I found other documents describing Stirling-cycle coolers, but don't have them saved anywhere. Let me know if you want me to take a look again.
July 27, 2015 07:01:49 · Reply
July 25, 2015 18:32:58
July 27, 2015 03:55:47
Mark Beeunas Hi Ben: In your research you have seen reference to the 'magneto-optic Kerr effect' and its application for a Kerr Microscope, looks interesting, 'probably non-trivial'. Also, an ad hoc idea: A cursory review indicates there is a spectral component to the magneto-optic effect so with the right optical material maybe a frequency tunable wave cell could be constructed (likely several stages). Again, very ad hoc, it would also seem this effect would be more crisp at lower temperatures (i.e. less thermal giggling/spread). But, maybe the distributions for all of optical sections are inherently to broad to resolve anything useful. Cheers Mark Beeunas
August 4, 2015 05:15:16 · Reply
Marc-Andre Ferland In the video, you said that water is not a liquid crystal. But it is... Source: Dr. Gerald Pollack, University of Washington, Professor of Bioengineering, 32nd Annual Faculty Lecture, https://youtu.be/XVBEwn6iWOo I'm not sure if that could change anything about this video ? Could that also be a reason as to why the light intensity changes ?? Also, i would be interested to know your opinion on Dr. Pollack presentation and his testing methodology. Edit: In the presentation Dr. Pollack shows that the exclusion zone created by the organized structure of water will show on a Polarization micrograph and that it will have an effect on the alignment/polarisation of light, but he does not go that much in detail about light polarisation..... A more recent talk by Dr. Gerald Pollack, it give information about newer experiments done since and also gives more information about the impact of the organized water on other fields of science. Part 1 https://www.youtube.com/watch?v=JnGCMQ8TJ_g Part 2 https://www.youtube.com/watch?v=hqHWueBp23c
August 5, 2015 02:26:12 · Reply
August 1, 2015 04:05:54
Rikkitikki Tavicat (Rikki Simons and Tavisha)
August 1, 2015 06:59:00
August 10, 2015 08:40:38
August 16, 2015 22:12:27
August 29, 2015 16:38:26
jason black I've also seen people light thermite with a household match. The trick is to put a pinch of sulfur powder on top of the thermite. Not sure I'd want to light thermite with my hand that close to it, but there you go. Here's an example vid: https://www.youtube.com/watch?v=LAmRtO6XOGk
August 29, 2015 18:24:38 · Reply
August 31, 2015 07:01:51
Simon Gustav Håkansson Could you post a gif of the drill bit animation?
August 31, 2015 18:53:17 · Reply
September 1, 2015 04:50:04
Earl D Yates Thanks Destin! While I hope that these Scientists are able to find a way to stop the spread of this disease, there are some far reaching implications. This is the first time that I've ever heard of a cancer that is contagious. If a strain of cancer can become communicable among Tasmanian Devils, there is a possibility that some strain of cancer could mutate and become contagious between humans. So, helping to find a cure for these rare critters may in turn, help to prevent a similar outbreak among the human species.
September 3, 2015 21:33:43 · Reply
Rikkitikki Tavicat (Rikki Simons and Tavisha)
September 1, 2015 06:59:00
September 10, 2015 20:05:11
Brian Antonelli Awesome video, thanks Destin! Call me crazy, but I would love to see a video just on how you produced the radar. :)
September 15, 2015 16:01:41 · Reply
Jason VandenBerghe This was AWESOME. And, it might seem like a little thing, but thanks for the Patreon shout-out. Somehow made it real that we're all doing this. :P
September 22, 2015 10:04:24 · Reply
Andre Alforque Thanks for this tour! Definitely helps put the station into perspective.
September 22, 2015 23:53:27 · Reply
September 20, 2015 00:54:21
September 28, 2015 01:00:51
October 1, 2015 05:00:56
i❤computers Already my fav epi!!! I say that cause POVs were a big thing among the maker community. Heck, we even added them to the spoke of our bikes (www.ladyada.net/make/spokepov). Seeing that moving average visualized and graphed and applying a POV video effect on that high-speed footage finally brought to light the illusion makers were exploiting all these years :D
October 1, 2015 11:22:24 · Reply
Kyle Sayers Super awesome video! What I love about Destin is that he's learning with us. It's not a lecture that glosses over a bunch of stuff, but a real human who gets excited, just like we do. Keep doing what you do :)
October 2, 2015 02:18:00 · Reply
Rikkitikki Tavicat (Rikki Simons and Tavisha)
October 1, 2015 06:59:00
View all 16 comments
Travis This video is Awesome! Started watching a couple of weeks ago after I saw the Backwards bike video. These 2 videos have me hooked and I really just want to say thanks for everything you do. I would also like to agree with Levi on everything he said. First time I got chill like that in awhile. Thanks
May 14, 2015 20:00:11 · Reply
Weatherlawyer Your man needs to take lessons in communication techniques.
June 1, 2015 18:35:36 · Reply
Nathan If anybody from the internet could some awesome videos and teach science from space, it would Destin
June 2, 2015 05:13:11 · Reply