Jonas Salk, who developed the first safe and effective vaccine for polio, was born 104 years ago today. Thanks to widespread use polio vaccines, the disease has now been eliminated from most of the world.

Learn more: https://www.eb.com/biography/Jonas-Salk

Baobab trees have unusual barrel-like trunks and are known for their extraordinary longevity. This tree in Madagascar is estimated to be more than 1,000 years old.

Learn more: https://www.eb.com/plant/baobab-tree-genus