Since April 8, when I witnessed a total eclipse of the sun, I've been feeling progressively more melancholy. It isn't because I was underwhelmed, or because my vantage point wasn't ideal, or because of some depressing epiphany I had while watching the moon turn our planet's star into a wispy ...

Very soon, a robot surgeon may begin its orbit around our planet — and though it won't quite be a metallic, humanoid machine wearing a white coat and holding a scalpel, its mission is fascinating nonetheless. On Monday (Jan. 29), scientists will be sending a slew of innovative experiments ...