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Comment Re:What about HDRI? (Score 1) 249

Most modern displays also tend not to be able to show anything over 1920x1080 (or thereabouts, often much smaller), & yet we still use formats that support much larger images. Just as you can zoom, you can change the display exposure with an HDR image. I suspect the lack of support is more related to most cameras not producing HDR, while they do have resolutions higher than monitors.

Comment Re:So, how long has the NSA had one? (Score 1) 189

Quantum computers give a square-root speedup to search operations (of which bitcoin mining is one). So all that would happen is that the difficulty would be roughly squared once most miners had sufficiently large & fast quantum computers. Since the square of the difficulty is nowhere near the limit, it would still be safe for a long time.

But yes, the first person to do it (if they had a powerful enough quantum computer—not the one in the article) would probably get all the blocks for the next few difficulty adjustments (assuming no one else noticed & did the same) pretty quickly.

Since bitcoin accounts use public-key cryptography, they might not be safe in the long run, though (depending upon which variety they use, which I do not know off hand).

Comment Re:Not so bad to have different systems. (Score 1) 2288

1 meter is the distance light travels in 1/299792458 seconds. Yes, that involves the speed of light, but the constant is based upon the previous standard (a meter rod) that was in turn based upon the size of the Earth.

Likewise, a second is based upon Cesium, but I forget the constant or exactly how it relates off hand. It was chosen to make it be very nearly 1/86400 of a day, of course.

Just because there are nice prefixes does not mean the base units are any less arbitrary.

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