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Science
Montgolfier brothers flight, 1784
Science
Ernst Haeckel's "tree of life", Darwin's metaphorical description of the pattern of universal common descent made literal by his greatest...
Health
This physical therapist is assisting two polio-stricken children holding on to a rail while they exercise their lower limbs. In the early...
Science
The Austrian-British philosopher of science Karl Popper (1902–1994) in 1990. He is best known for his work on empirical falsification.
Antarctica
Image of the largest Antarctic ozone hole ever recorded due to CFCs accumulation (September 2006)
Matter
Nitrogen dioxide (NO2) on the left and dinitrogen tetroxide (N2O4) on the right.
Air
Oxygen content of the atmosphere over the last billion years
Air
Blue light is scattered more than other wavelengths by the gases in the atmosphere, surrounding Earth in a visibly blue layer when seen...
Stars
Some of the well-known stars with their apparent colors and relative sizes.
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