Lecture 23: Worlds Within: Atoms

What is Matter? This lecture reviews the nature of matter from
subatomic to atomic scales, and introduces the ideas of atomic
structure, atomic number (number of protons), the elements, isotopes,
radioactivity, and half-life. We conclude with a brief overview of the
four fundamental forces of nature: gravitation, electromatgnetic, and
the strong and weak nuclear forces. Recorded 2006 Oct 24 in 100
Stillman Hall on the Columbus campus of The Ohio State University.