|Bill likes to keep our attention by electrocuting himself while lecturing|
In physics, we learned about electrical charges. We reviewed the basics (like charges repel, opposite charges attract) and we rubbed plastic pens on our shirts to make them pick up bits of paper. Electric charges are a fundamental property of matter and cause interactions between objects, creating forces (the electric force, named such for obvious reasons). Charge is measured in units of coulombs, and a coulomb is 6 x 10^18, or a billion billion electrons.
|A strange type of squid; it has the largest eye-to-body ratio of any animal|
|An analogy between electric fields and gravitational fields|