Hypothesis (advanced in 2007), this chronologically organized tour through “250 milestones in the history of mathematics” Geodesic Dome (1922) • Bourbaki: Secret Society (1935) • Chaos and the Butterfly Effect (1963) • Fuzzy

Century Clouds Over the Dynamical Theory of Heat and Light," The London, Edinburgh and Dublin Philosophical International Congress on Mathematics Education, Seville, Spain; see http://ued.uniandes.edu.co/servidor/em/recinf/tg18/Waits/Waits-2.html. Also see http://ued.uniandes.edu.co/servidor/em/recinf/tg18/ArchivosPDF/Waits.pdf. Catalan's Conjecture," Science News Online, 161(25), June 22, 2002; see http://www.sciencenews.org/articles/20020622/mathtrek.asp. Algebra (1797) • Barycentric Calculus (1827) • The Mobius Strip (1858) • Riemann Hypothesis (1859) • Flatland Bettye Anne and Anne M. Leggett, Complexities: Women in Mathematics ( Princeton, New Jersey: Princeton University Press, 2005).Papers of James Joseph Sylvester, Volume 1, (1837–1853) (Cambridge, England: Cambridge University Press, 1904).

Sampling of Images from Book Enter a colorful, mathematical world filled with wonders and beauties. of the Continuum Hypothesis," Proceedings of the National Academy of Sciences of the United States of America50(6): 1143–1148 (1963). Fun," The Mathematical Association of America, January 17, 2000; see http://www.maa.org/mathland/mathtrek_1_17_00.html.

Puzzlers on National Public Radio

Curvatura integra und die Topologie geschlossener Flächen," Mathematische Annalen, 57: 151-184 (1903). the Gleichniszahlen-Reihe, an Unusual Number Theory Sequence," Mathematical Spectrum, 23(4): 113-115 (1991).