Some animals, like earthworms, snails, and spiders, have nerves but not actual brains.
A one-year-old child's brain weighs about 2 pounds (950 g), ten times the weight of a dog's brain.
The primate cortex is so large that it has to be folded to fit inside the skull. That's why the surface of the brain is wrinkly.
The nervous system runs on electricity, but the levels are low. Brain signals involve less than one-tenth the voltage of an ordinary flashlight battery.
AT THE MUSEUM
See how good you're at recognizing emotions.
How fast can you catch a falling ruler? Measure your reaction time.
Take the jellybean test to see how your sense of smell enhances taste.
Use Braille to create a message for a friend.
Explore your nerves by creating a life-sized drawing.
Try these trippy experiments to fool your brain.
Scientist Rob DeSalle answers kids' questions about the brain!
Test your sight and memory with these brain games.