A child astronaut takes an imaginary trip to Mercury, learns about the harsh conditions on the rocky planet, and decides that Earth is a good home after all. Includes solar system diagram, Mercury vs. Earth fact chart, and glossary.
A child astronaut takes an imaginary trip to Venus, learns about the extremely hot and harsh conditions on the planet, and decides that Earth is a good home after all. Includes solar system diagram, Venus vs. Earth fact chart, and glossary.
Ava teaches her younger brother Noah that the brain is like a computer, controlling the body through the spinal cord and the nerves.
