The border collies, named Berkeley, Piper, Marcy, and Kayle, are part of a National Geographic-sponsored search for clues about the fate of the famous aviator.
Ancient monuments, clay tablets, paintings, and photographs reveal the power that solar eclipses have had on the imaginations of prehistoric and modern civilizations.
The letters from Einstein to colleagues, which will be auctioned on June 20, reveal his thoughts on physics, God, and Israel.
