1989 - Charles John Pedersen died.

Pedersen was an American biochemist who shares the 1987 Nobel Prize in Chemistry with Donald Cram and Jean-Marie Lehn for their research and development of host-guest chemistry. Host-guest chemistry is where two or more molecules/ions bond in unique ways due to their structure in other than covalent bonds. Pedersen's work was with the chemistry and synthesis of crown ethers or cyclic polyethers.

1972 - Igor Sikorsky died.

Sikorsky was a Russian aeronautical engineering pioneer who developed the first functional helicopter and the first multi-engine airplane. He also designed the Pan-Am Clipper flying boat, the chief ocean crossing airliner of the 1930s.

1959 - Far side of the Moon seen for the first time.

The Soviet space agency released a photograph of the far side of the Moon taken by the Luna 3 (Lunik 3) moon probe. Due to the Moon's synchronous rotation, where it rotates at near the same rate as it revolves around the Earth, only one side of the Moon has ever been seen. The Luna 3 probe was the first spacecraft to orbit the Moon and returned the photographs of the unseen far side.