By increasing the amount of serotonin in the spinal cord, an experimental drug helps nerve connections work better. Bee Smith/Ocean/Corbis hide caption

itoggle caption Bee Smith/Ocean/Corbis

I'm not trying to lead you astray. It's just that scientists are not skeptical enough about their mouse studies. iStockphoto hide caption

itoggle caption iStockphoto

President Obama has pledged millions of dollars to fuel research into understanding the workings of the human brain. Zephyr/Science Source hide caption

itoggle caption Zephyr/Science Source