NASA said Tuesday that SpaceX will switch capsules for upcoming crew flights to bring Butch Wilmore and Suni Williams home in mid-March instead of late March or April.

Is Earth really exceptional?  A new book seems to reaffirm that notion.  But given the right conditions, primitive life may be a mere byproduct of biophysics.

To solve that problem, a team of German researchers at the Technical University in Berlin figured that, instead of having a ...