What is ordinary matter made of? This lecture reviews the basic
properties of matter from subatomic to atomic scales, introducing atomic
structures, atomic number and chemical elements, isotopes,
radioactivity, and half-life, ending with a brief overview of the four
fundamental forces of nature: gravitation, electromagnetism, and the
weak and strong nuclear forces. Recorded 2007 Oct 23 in 1000 McPherson
Lab on the Columbus campus of The Ohio State University.