The Apollo Program’s lunar excursion module (LEM) display at the Smithsonian’s Air and Space Museum; a lesser-known fact about the moon landings is that the fold on the LEM is 24 karat gold, selected because pure gold is the least chemically reactive of all the metals.

The Apollo Program's lunar excursion module (LEM) display at the Smithsonian's Air and Space Museum; a lesser-known fact about the moon landings is that the fold on the LEM is 24 karat gold, selected because pure gold is the least chemically reactive of all the metals.

The Apollo Program’s lunar excursion module (LEM) display at the Smithsonian’s Air and Space Museum; a lesser-known fact about the moon landings is that the fold on the LEM is 24 karat gold, selected because pure gold is the least chemically reactive of all the metals.