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Joined 1 year ago
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Cake day: July 9th, 2023

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  • That is quite a complex task. Being able to focus the beam in a certain direction is one thing. And it is the easier part.

    But where should it focus to? You cannot just base the up/down position of the head and therefore the lamp as such, you also need to know where the wearer is looking left or right of the direction of travel. Just imagine you are sitting in a car and a guy with such a headlamp is coming in your direction. All this biker needs to do is just turn his head and look at you for some reason, and blam! You are staring right into a blazing array of LEDs.


















  • They will be called “variables” in the future, and scientists will try to figure out how they tick. And: They were seen as constants for a sufficientyl long time, so still treating them like constants won’t hurt, as the value will probably only vary over long reaches of time or unlikely/uncommon circumstances like relativistic speeds.

    We treat g = 9.81m/s², well knowing that this changes depending on height and location. But this value is totally sufficient for everyday purposes, and no bridge will ever collapse just because of local derivations from 9.81. The precise local value of g is only of relevance for a very small range of applications.