Do Squirrels Smash Acorns Into Their Little Faces?

When you're observing things in nature, it is not a laboratory environment. So eliminating the variables that are inevitable when you have sort of this chaotic natural environment can pose a kind of tricky thing for research. There's just a limitation to how much you can learn by observing stuff. We know something about what's inside squirrels, but we have deep questions about what's at the heart of neutron stars and black holes.