Samir’s Selection 10/22/2014 (p.m.)
Astrobiology: Bolts from the blue >>>
WHERE are they? Aliens, that is. Why is there no sign of intelligent life in the universe anywhere other than on Earth? That question has puzzled inquiring minds for centuries…
They reckon that, before about 5 billion years ago, GRBs were so frequent that life would have struggled to establish a foothold anywhere in the cosmos. If astronomers ever do discover life on another planet, then, it is unlikely to be much older than life on Earth itself.
Martin Gardner, puzzle master extraordinaire >>>
Posted from Diigo. The rest of my favorite links are here.