The video below is one of Hank's songs, Strange Charm. It's about quarks. Quarks are a type of particle that makes up matter. Most of the matter we see around us is made from protons and neutrons, which are composed of quarks. The most recently discovered quark (the top quark) was announced in 1995! (A shout-out to Fermi National Accelerator Laboratory near Chicago, IL for the discovery!)
There are 6 types, or "flavors" of quarks: up, down, charm, strange, top, bottom. Each quark carries a fractional charge, and a color charge. (?!) According to the theory of quantum chromodynamics, quarks are always combined in groups of three quarks (of different colors) or as pairs consisting of a quark and an antiquark (of the same color). (??!!) This is more than my brain can handle, but it is pretty cool.
If you want to learn more about quarks, I suggest visiting the following sites:
- Need a refresher on atomic structure? Visit the Chem4Kids page or watch a Khan Academy video about atoms.
- Quarks page on particleadventure.org
- Howstuffworks - Quarks
Hank Green is also known for his blog, EcoGeek, which he began in graduate school as a class assignment!