Some dinosaurs were as small as chickens.

Honey is made by bees from flower nectar.

The Hubble Space Telescope has been taking pictures of space since 1990.

Some seeds, like coconuts, can float across oceans to grow on new islands.

Monarch butterflies can migrate around 3,000 miles to spend the winter in Mexico.

Gutenberg's printing press, invented around 1440, made books much cheaper and helped more people learn to read.

Squirrels plant many new trees by burying acorns and nuts in the fall and forgetting where some of them are.