Cacti can store water inside their stems for months.

There are about 1,350 volcanoes on land that could erupt someday.

The Argentinosaurus may have been as long as three school buses.

Crayons were first sold in 1903 in a box of eight colors.

Chocolate comes from the seeds of the cacao tree.

Octopuses can change the color of their skin in less than a second.

Penguins can't fly, but they are amazing swimmers.