What part of your body is almost equal in weight to all the microbes in your body?
your brain
5
How many bacteria are in your gut?
as many as 100 trillion
5
How do the microbes in your gut send signals to your brain?
There are cells in your intestines that extend all the way into your brain, and microbes send signals directly to the brain using those cells as a highway.
15
When Elaine Hsiao observed communication between two mice, what did she notice about the mouse with no microbes?
it was less social
10
What happened when she put microbes back into the mouse?
