1939 in science

full body exercise based on squat thrusts, providing cardio and strength training

sphere of ionized hydrogen around a young star of the spectral classes O or B

overview of natural science-related events during the year of 1939

star in the constellation Monoceros

metal rod in the marrow cavity of a bone, usually used to treat fractures of long bones

20th-century annular solar eclipse

20th-century total solar eclipse