"It was August 27, 1885. In a hospital in Lima, Peru, a student named Daniel Carrion was preparing to infect himself with a dreaded disease . . . He had a small, sharp lancet ready . . . Carrion's friends and teacher from the medical school thought it was a bad idea. They knew Carrion was eager to learn more about this mysterious disease.
But were the risks worth it?
"Science and medicine from the inside out-ten engrossing stories of self-experimentation
Who are these "guinea pig scientists"? Searching for clues to some of science's and medicine's bigger (and sometimes stranger) questions, they are all the men and women who devoted their lives to help find the answers. Spanning from the 1770s to the present--and uncovering the science behind digestion, the spread of yellow fever, the development of the first heart catheter, and more--their ten stories are at once scientifically detailed and fascinatingly personal.

Animal signs are everywhere in nature and this guide will help kids learn all about them. Kids will find out how to spot and identify common clues that 17 wildlife species leave behind in the woods, in fields and along ponds. This guide is a fun way to turn everyday walks into exciting mysteries--and make any child a nature detective.