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Joined 2 years ago
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Cake day: August 9th, 2023

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  • I call BS on this particular experiment. I just don’t trust that they did it right.

    Those $2 gas station lasers shoot faint light out in a large cone. What I mean is, look at the barrel of one of those lasers when it’s on. (Don’t aim it at your eye, obv.) There is almost a 180° range where you can see red light at the tip of the laser.

    He’s holding the laser directly above the mirror at a 45° angle, so some of that scattered light will be hitting the mirror. Just because the camera can’t see the laser’s tip in the mirror doesn’t mean it’s not visible from the mirror’s perspective. There’s an enormous amount of parallax between the two perspectives. It’s so stupid that he looks at the camera’s view and says, “You cannot see the laser light at all, right?”, and doesn’t realize it’s because of parallax! 🤦

    Meanwhile, even we the viewers can see laser light in our camera when it’s not aimed even remotely toward us. Look:

    So this diffuse light is hitting the mirror and film, and because it’s a diffraction grating, some of it is redirected to the camera.

    Do I doubt that there are bizarre physics that can happen in proper experiments like this? No. I don’t doubt people like Feynman. I just think this experiment is bullshit. Much like the entire channel.


    The rest of this comment is just a rant. You should probably stop reading.

    I can’t stand that guy’s absolutely fake reaction. There’s no way he didn’t do this experiment a few other times in front of the camera, and he’s just making this over-the-top, fake, hysterical, “WHAT!? OH MY GOD, NO WAY!” Over and over. Ugh.

    Speaking of fake. Why is the video call on this laptop screen edited in? It jumped right out at me as soon as I saw it.

    The top and bottom edges of the video aren’t parallel to the screen, and there’s no glare. The bottom edge is the worst:

    Why would he fake this? It’s a one-second clip. It’s not even important. I guess he needed more B roll of himself looking thoughtful and nodding.

    I hate Veritasium ever since that incredibly dumb video about the “speed of electricity” where he made electricity sound all mystical and magical, and didn’t once use the word “induction”, and basically lied about everything. It was so bad that a dozen other science YouTubers had to make reaction videos explaining how wrong he was. Like Alpha Phoenix.

    Veritasium is overproduced garbage masquerading as science.









  • Yeah, it looks like you’re right. Not sure what I read years ago. This is what Wikipedia says:

    Mikao Usui originated the practice in Japan. According to the inscription on his memorial stone, Usui taught his system of reiki to more than 2,000 people during his lifetime. While teaching reiki in Fukuyama, Usui suffered a stroke and died on 9 March 1926.

    So, apparently before 1926. Still, really far away from “ancient”.







  • It also helps to have the fan blowing out be a few feet from the window. The Bernoulli Effect will cause more air to be blown out the window than having the fan right in the window. This isn’t always convenient, though.

    My personal favorite fan for this is a Vortex DC fan. It comes in a few sizes, and I have a couple of the 533DC models. They move a ton of air for less power than an AC fan. Plus it has seemingly infinite speed settings. They’re great on a desk on a low setting blowing right in your face when it’s hot. When you aim one out a window a few feet away, you can stand in front of an open window on the opposite side of the room and feel a breeze of fresh air flowing in!

    In my experience it’s better than one of those twin-blade window fans by a mile, and better than a big box fan, too. But in a stairwell, it might not work because where are you going to put it? It’ll be in the way.

    Of course nothing beats taking an old HVAC centrifugal fan, covering the sides with a grill, and sticking it in the window, blowing out. That’ll make a breeze in your whole apartment! I did that once when I lived on the third floor of a house. In my bedroom on the opposite side of the apt, I had my bed right next to a window. That breeze that blew in on warm summer night was wonderful!

    I went to an HVAC shop and asked them take a fan and motor combo out of any old furnace they had replaced. I only paid $35 for it about a week later. Then I covered the sides with hardware cloth, using sheet metal screws, wired it to always be on high, and threw a switch on it. I used metal angle brackets to allow the window to shut down onto it. Best thing ever! I greatly prefer fresh air over AC unless it’s peak summer.