Dean du Plessis could tell Zimbabwean cricket had turned a corner by the noise of the crowd. The veteran broadcaster, who was born blind, has forged a remarkable career as a commentator by distinguishing the game’s almost imperceptible audio shifts. He can tell a slower ball has been bowled by the fractional delay before ball meets bat. He can tell if a batter has pressed forward or back by the scratch of spikes against the hard pitch. And, in 2018, he could tell the sport he loved would never be the same again.
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"It's a support for women who maybe don't know what's going on with their bodies."
But what if it’s not fine? Even back in 1996, before a single component of the ISS was launched into orbit, NASA foresaw the possibility of an even worse worst-case scenario: an uncontrolled reentry. The crux of this scenario involves multiple systems failing in an improbable but not completely impossible cascade. Cabin depressurization could damage the avionics. The electrical power system could go offline, along with thermal control and data handling. Without these, systems controlling coolant and even propellant could break down. Unmoored, the ISS would edge slowly toward Earth, maybe over a year or two, with no way to control where it is headed or where its debris might land. And no, we could not save ourselves by blowing the station up. This would be extremely dangerous and almost certainly create an enormous amount of space trash—which is how we got into this hypothetical mess in the first place.，详情可参考91视频
Once Koch established the methods to grow pure cultures of bacteria like tuberculosis and anthrax, he demonstrated for the first time that microbes can cause diseases, a feat that earned him the 1905 Nobel Prize in Physiology or Medicine.
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