What do scientists actually do when testing them?

Many things For instance watching one freeze to death so that reading can be made as to what exactly happens. Or here is a good one see what changes in the blood occur as a result of excruciating pain. Or here is a nice one spraying makeup chemicals in their eyes to see how much they can take before they go blind. These perverts can think of any number of things to do to animals and humans to satisfy their curiOSity.