367 karma · joined April 19, 2009
Running in small (10m) diameter cylinder increase gravity significantly without need to spin the cylinder.
Anyway to minimize effects of Coriolis force in spinning cylinder, I think that the size of the cylinder would be significantly larger than the size in the movie.
I understand that 16GiB (16*2e30 bytes) chip is present (delivered to user), but some of it is broken and not available (industry standard). Therefore capacity is less than 16GiB. Also I believe that there is a threshold, that manufacturer is using to throw away chip that are too broken to be sold. Ok so far.
So proper declared capacity should be threshold value (minimum) or threshold to maximum value declared range. I understand that this proper capacity is not very nice round number.
Problem has past: Around 2000, manufacturers started using GB (10e9) instead of GiB (2e30) that gives them some margin (7%) for chip defects. Later margin was not enough, so they started using more misleading specs like this. It seems that margin is at least 10% nowadays instead of <7% in the past.
Personally, I would be satisfied with stated margin size (like 7%, 10%, 12% etc) to maximum capacity, f.e. "USB flash drive 16GB max capacity, at least 90% usable."
We should try to use more easily recyclable materials (steel, aluminium?) for some stuff we made of plastic now (bottles? car parts? ... ) but it cost a lot more. Try to compary stainless steel straw and plastic straw :-(
I agree that simple fuels makes more sense to synthesize. Methane is simple, but way more difficult to handle than gasoline. 1-butanol and other liquids would be great, but it is not so easy to produce in scale yet, I believe.
Physical separation is needed for lanes with radically different speeds. Today, sidewalks (4 kmph) are separated from cars (40+ kmph). Because of demand of people traveling around 20 kmph, we need another separated lane for bikes and other e-mobility crowd that is able to move approx. in range of 10-30 kmph. Because of safety new lane must be physically separated.
Also, there should be wise to set some speed limit for these lanes, like 30 kmph, for cases when lane is used by hi-powered e-mobility vehicles.
In theory, parts of town where car speed is so limited to speed of bikes (25 kmph?), separation in many cases disappear. Nobody wanna be driving in such speed anyway.