If you live in the contiguous United States, you'll be able to see a partial or even total solar eclipse on Monday. It will probably be really amazingly cool, unless you do one thing:
Yup: Do not do this. Do not look at the solar eclipse with your eyes, unless you are in the narrow path of totality, in which you have a couple of minutes in which to look at the blackened sun. This scientist shows why, by using a real pig's eyeball and putting it in the path of the sun for a few minutes.