Spinal Cord. There are more than 1 billion neurons in the human spinal cord.

Positron. A positron is an electron with an opposite, positive charge, which is what makes it anti-matter.

Animal. Coral gets most of its energy from photosynthetic unicellular algae.

Batholith. A batholith is a big bubble that pushes the layers of rock on top of it upwards.

1957. Project Mohole was an attempt to drill through the Earth's crust.

John Glenn. Alan B., Virgil I., and Malcolm Scott just don't have the Herschel as John did.