In 1950 the famed Italian physicist Enrico Fermi asked his coworkers at the lunch table the simple metaphysical question in regard to possible aliens...

Evolutionary scientists would like nothing better than to find life (in any form) outside Earth. But so far this has been lacking. The pages of the book...

The Coconino Sandstone, famously exposed near the top of Grand Canyon’s splendid sedimentary layers, remains a controversial rock. Two counterclaims...