William Harley and Arthur Davidson, founders of the Harley Davidson Motorcycle Company.

Using a bear to treat back pain. Romania, 1946.

Setting a new world speed record, 1948.

A sex education lesson, 1929.

Lumberjacks, 1900’s.

A gun used for duck hunting, early 20th century.

Filming the production logo for Metro-Goldwyn-Mayer.

Military electricians, 1918.

Testing a rugby helmet, 1912.

A pilot tries to start the stalled propellor of his plane during flight.

Young women in Kabul, Afghanistan, 1970’s.

Drew Barrymore helps Stephen King light a cigarette.

Source: AcidCow