Excite and Inhibit

OMG OMG! A 5th Grader in India wants to know, "how many nervous systems are there"

Here's an answer:
In you there are two major kinds of nervous system: central (brain, spine), and peripheral. In animals, there are 2-sided (yours) and radial (jellys) systems. Read More

Wow, the brain is so cool!
Hey, what's the one thing you wish you knew about the brain?