Ganymede. Ganymede is the largest satellite and seventh moon of Jupiter.

Leonardo Da Vinci. Although Leonardo Da Vinci is best known as an artist, he was also a sculptor, musician, architect and scientist.

Peat. Peat can be dried and burned for fuel and heat.

Eurus. In Greek mythology, Eurus was the deity representing the unlucky east wind.

The Moon. The Moon completes an orbit around Earth in about 27.3 days.

Virus. A virus can be 1,000 times smaller than a single bacterium.