Comments by "Mikko Rantalainen" (@MikkoRantalainen) on "Veritasium" channel.

  1. 7:15 The image is made out of round blobs because your light source is a round thing called the Sun instead of a true point light that exists only in mathematics. The slit works a bit like pinpoint camera and you end up with the image of the sun (multiplied by the interference of the lightwaves).
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  2.  @shashwatsen7150  Sunlight is definitely not coherent light. It has photons with different frequencies.
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  3. I don't think Red Bull will do that unless they can send live video back. Our current understanding of general relativity suggests that there's no way to communicate any information back over the event horizon. Red Bull seems to be a firm believer of "if nobody is seeing the tree falling, the tree is not falling".
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  4.  @timoord1611  Supposedly this vehicle can do faster than wind so any smoke in front of the vehicle should go through the fan because the vehicle wouldn't run faster than wind. As such, a good demonstration would be to have the smoke quite a lot in front of the vehicle and when the vehicle catches the smoke (which is moving with the wind!) it's both obvious that this is indeed faster than wind movement and we would be able to see the wind movement near the fan.
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  5. I think you should do similar video about every great scientist. For well known ones such as Einstein, you could obviously focus on something less well known aspect of his inventions for that episode.
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  6.  @WlatPziupp  As I see it, it's a valid research platform for teaching AI to keep the robot upright. However, I don't agree with the design limitation of having two feet with multiple joints when three more simple legs would be more stable and easier to manufacture.
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  7. I would guess you could fake a poor test result by forcing yourself to give answers faster than the test requires and then trying to do your best. For example, after every test case, take a 30 second wait time without looking at the next test case. Because g-factor is mostly about how fast you can execute tasks, that should be enough to bring your totals down.
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  8. You can think it as a lot of matter on the surface of the start falling towards the core. When that fall is long enough and the star is massive enough (meaning the acceleration of those atoms is very high) the collision of the atoms in the middle is hard enough to fusion elements that the star was not able to fuse while it was going normally. And every time fusion happens with elements lighter than lead, you get extra energy. And the extra heat from that fusion getting hit with more atoms still falling from the surface will cause even more heat and fusion with very rapid chain reaction. I would guess that the reason supernovas always look similar is related to the fact that elements heavier than lead do not release energy when fused.
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  9. And look at all those trees! It's pretty clear that the slide happened pretty deep in the soil.
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  10. 13:15 I think you could extract even more information from the GoPro video if you normalize every frame to have range from 0 to 255 (assuming you had 8 bits per channel recording). I don't know if it matters if you normalize the values in log or linear colorspace, though, so maybe check both?
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  11. You're so going to hate HDR TV sets in the future if you watch movies in dark room...
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  12. And everybody agreed that Earth goes around the Sun, not the other way around.
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  13. Can you use a laser (with a lens) instead of led as the light source? That should allow getting more photons for the high speed camera.
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  14. Considering that one average banana has mass of about 0.2 kg, 20 million bananas would have total mass around 4000 tons or about a hundred big semi trailers fully loaded with bananas, so you would be crushed under the bananas even before you could eat those!
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  15. If I understand this correctly, basically the wheel breaking force is used to rotate the fan which then moves air faster than wind through the fan. As a result, the forward speed can be up to wind speed + the speed of air moved by the fan. The video failed to explain what the left side control actually did; was it similar to helicopter collective control?
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  16.  @Nabeelco  The fact that rotor spins during the autorotation simply increases the wing speed and therefore causes more lift. Of course, if the rotor stops spinning, the wing speed is so low (the wings being the blades of helicopter rotor) that the helicopter is going to fall.
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  17. 6:00 Pro tip: if you are trying slackline for the first time, setup it around 30 cm (1 ft) above the ground, not high.
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  18. Superb video and the first time I really understood how the bottom part of a modern sewing machine works!
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  19. To get pretty good idea how different stitches are made, try search "groz-beckert stitch type slow motion". That should result in multiple animations by a German sewing machine manufacturer.
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  20. These are not the astedroids you're looking for.
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  21. 16:26 Big amount of snow moving on the hill looks surprisingly similar to foam on top of the sea.
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  22. "Science, like magic but real"
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  23. Great video! I would have liked to know more about the artificial snowflake initial seed - I think the video talked about saphire in some points. Why does that work?
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  24. That's a great example of human vision system trying to detect faces everywhere.
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  25. THIS! I can proudly say that I have never owned a smartphone that I cannot replace the operating system. Sadly, I cannot say the same about all the cars even though I do most repairs to those too by myself.
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  26. Imagine travelling to all these place only to make this video!
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  27. To capture content with really high luminocity scale you could use two cameras with one shooting through partially reflective mirror at 45 degree angle and another shooting the image via the mirror surface. If you use e.g. 90% reflective mirror, you can use the same exposure for both cameras and have 10x more light for one camera. Of course, this requires very solid stand for the cameras because you want to make the cameras pixel perfect to the target even though the cameras are orthogonal to each other. You also want to use prime lens for both so that differences in zoom do not mess your resulting image. And of course, you can use more mirrors and cameras to capture more exposures. When every camera uses identical settings (aperture, shutter time, ISO, etc) you get perfect image when you combined all the resulting videos from all the cameras.
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  28. There have been claims that bears have actually much better ability to detect tinyest amounts of smells – even better than dogs. It would be interesting to know if this is actually true.
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  29. Great video! I didn't know that graphite in pencil is hold together only by Van de Waals forces.
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  30. Have you already seen videos by Vsauce? He, too, is pretty good in mind blowing. HIs "How Earth Moves" is a nice counterpart for this video.
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  31. I think we would need worldwide legislation that if you publish some piece of news on your news website or other distribution site, corrections to said piece of news must always have equal or greater visibility on your platform and you're required to publish such corrections if you published the original piece of news. That would put at least some incentive to publishing probably wrong stuff on the front page of your publication because you would highly probably end up publishing the corrections later with similar visibility. If you would continue to publish crap, at least half of your content would be corrections only pretty soon. And note that this should include all news, not just science related news. Obviously yellow journalism wouldn't want any of this.
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  32. Am I the only one that doesn't get clickable objects over the video at the end?
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  33. Would it be possible to grow actual Gecko hairs on some artificial material using live cells from a gecko? If I understood correctly, once the hair has grown, it's not a living thing (similar to human hair).
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  34. I think this would have been better without the music in the background while you're directly in the camera. Background sounds in the clips are great. You should not be afraid of having some silence in the video. Other than that, very good story telling and timing.
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  35. It seems to me that the wave collapse on measurement is such a huge sudden change in the system that it doesn't make sense. I've yet to understand why Pilot wave theory is not assumed to be the more accurate description of the universe. I do understand that Copenhagen interpretation and wave function collapse are mathematically easier to handle than Pilot wave theory – in the same way as Newtonian physics are easier to understand than the general relativity. Pilot wave theory explains the same real world measurements without a need for sudden collapse of the system on measurement and without a need for parallel worlds interpretation (many worlds theory). My guess is that Pilot wave theory is closer to reality but many worlds theory may still be usable because it results in the same predictions for all practical experiements and the mathematics are much easier to handle. Thatmakes many worlds theory the metaphysical truth: not exactly the real truth but pretending that the world behaves according to that description still results in practically flawless results.
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  36. Good video and I think you could have underlined the fact that science works this way in general – some research results are incorrect or incomplete and other researchers will comment about those details and then additional research is done to measure if the difference is important. Another thing that would have been worth explaining more is the situation where the circuit is not complete. The power is delivered over the gap in 1 m/c but the power will drop back to zero after some time (depending on the impedance and capacitance of the whole circuit combined with the resistance of the load).
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  37. I understand that gyros allow the mouse to understand the true orientation even if a wheel slips. However, how do they track the distance moved because even with the suction effect, wheels may slip and the true movement is less than the wheels rotate. Are the accelerometers accurate enough to integrate the distance travelled?
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  38. Try watching Cosmos: A Spacetime Odyssey hosted by Neil deGrasse Tyson, too.
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  39. I think you should have used land survey telescopes (or whatever those things are called which are used to measure building foundations using trigonometry and high quality optics). Those would have made it possible to accurately position the helicopter over the target area. Another option might have been high quality cross lasers and sensors in the helicopter. Again, use the stuff certified for building bridges and you should be fine automatically. Cell phone GPS in a partial metal container (helicopter) is not going to be accurate at all. And there exist helicopters with computer stabilized hover which should reduce the pendulum effect a lot. As would shortening the pendulum arm/rope.
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  40. 10:25 The face you make for "Oh, that aged well..."
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  41. Considering that atoms do not scale, your skin and walls of your veins would be about 100x thinner and would probably burst wide open from smallest forces so you would probably bleed to death even without the blender starting. Even with MSc in software engineering I think the biological limits would be the real issue here. And yes, I agree that this would be pretty bad interview question if you actually measured its effectiveness vs long term performance.
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  42.  @MthaMenMon  Wow! Combination of poor educational methods with limited number of tries. I haven't heard about anything equally stupid in education for a long time.
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  43.  @physics77guy  Here in Finland deriving formulas is not really done until university studies. And the skills of people suck a lot as a result.
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  44.  @freshrockpapa-e7799  Are you honestly claiming that education in schools has identical quality in different countries? I would recommend checking PISA research results one day.
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  45.  @freshrockpapa-e7799  I was replying to comment "no it isn't". How do you know what was actually meant and my interpretation as "identical" was incorrect?
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  46. 22:05 The beating effect from 261 Hz to one ear and 263 Hz to another ear with fully separated closed back headphones is nearly nonexistant for me.
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  47. I think the biggest problem with this video was that it started with electric car history (which was great, by the way). However, you didn't continue with the evolution of electric cars to current day as would have been usual for such content. As a result, many viewers felt that this was done to avoid mentioning Tesla. You even sensored the Mercedes logos in the beginning. You explain that the decision was yours and I believe it. Compared to your video about Mercedes-Benz Active Brake Assist and other Mercedes episodes, this failed to explain the science/tech instead of feeling like paid ad. The sponsored content is not bad itself as long as the video is and feels objective.
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  48. That's his April 1st prank – desyncronize with the rest of the world by a little bit.
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  49.  @eliasbergstrom5300  People have trouble truly understanding even 10000 years. Even 200 years is hard to grasp for real and that's only about 10 generations.
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  50. Stock markets cannot be truly random as long as people without understanding of statistics are buying any meaningful amount of stocks. I've been thinking for years that stock markets are about betting about what other people believe to be correct value for the stocks in the future. There's a lot of psychology in that equation and a lot of superstitious behavior (e.g. stock value graph having 3rd spike changes the overall direction of the stock because many enough people believe that 3rd time the charm; similarly, many people believe in special numbers such as 10, 100, 1000 and if stock value ever gets close to those numbers, many enough people suddenly change behavior again).
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