
Only about .003 percent of the water on Earth can be used by humans.

In 2013, a scientist injected human brain cells into a mouse brain, which improved the mouse’s memory and ability to learn.

A boulevard is a big, wide street with trees on both sides. A lane is a narrow, often rural road. A drive is long, winding, and scenic.

Louis Braille, the inventor of the reading and writing system for the blind, perfected it when he was just 15.

Albertonykus borealis is named for a dinosaur the size of a chicken. It lived in North America and ate insects.