Between the mid-1970s and early 1980s, two physicists, Michael Hart and Frank Tipler, published a controversial series of papers arguing that extraterrestrial intelligence didn't exist. As they argued ...
A tear in an ultra-fine blood vessel, just 100 microns wide — one tenth of a millimetre — must be meticulously repaired to restore blood flow to transplanted tissue taken from another part of the body ...
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