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Bob Lansdorp
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38 followers
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Bob Lansdorp's posts

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Poor presentation of statistics of rape
I came across this post: http://theenlivenproject.com/the-truth-about-false-accusation/ and was bothered by the presentation of information. The graphic they showed was: There is no such thing as an unreported false accusation of rape. Without knowing anyth...

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ISS with telescope
So after years of trying to get a video of the International Space Station, we finally did it! Here's the result: So how do you get a video like that? Well here's what the setup looked like a few minutes before ISS passed overhead! A telescope, some compute...

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How does World Cup Spray work?
In this World Cup, I was surprised when I saw a referee draw a white line on the ground for a free kick. "What a great idea!" I thought. But how does it work? Numerous google searches turned up meaningless articles such as this  that basically describe the ...

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The thermodynamic limit of bitcoin mining
There has been a trend in improving energy efficiency of Bitcoin mining machines. But how good can they get? What are the fundamental limits to the hashrate? What is the ultimate GH/J? We can use thermodynamics to explore this possibility. If we treat the c...

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Bitcoin mining
For fun, I just put together a Bitcoin mining machine! The machine does brute-force calculations to try to solve the mathematical problem of what input (random string), in combination with the current Bitcoin block header (that contains a list of transactio...
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