Huntsville native David Howard Thornton plays an evil mouse in "Screamboat," adding to his roles as fan-favorite baddies like ...

We expel carbon dioxide as waste. Naked mole rats bathe their brains in it to prevent seizures. The unique animals thrive underground but cannot handle the lack of carbon dioxide above.

When mice encounter an unfamiliar food, neurons in a brain region called the amygdala light up (blue). If the mice start feeling sick after the meal, the same neurons get reinforced to help the mouse ...