Installed in the year 1410, this giant outdoor clock in downtown Prague has been ticking for over 6 centuries, and is the world’s oldest astronomical clock still in operation.

Starship Prototype Serial No. 20. The gluing of the metal sheets to resist heat is almost complete. There are a number of cryogenic tests left before pairing with super heavy. Three Raptor engines were used in earlier Starship test flights....

When Michael Yon, an American war correspondent and photographer, accompanied American troops to Afghanistan in 2009 to begin photographing soldiers and their equipment there, he noticed an unusual phenomenon. As the helicopter took off or landed, the blades of the...