- 2017-march-31 Villanova math majors informal talk

**Precessing conic sections: black hole orbits and spin in general relativity come alive with Maple**../maple/misc/grprecession/precessing-conics.htm

- 2014-may-02 Villanova Pi Mu Epsilon induction talk:

**Spaghetti curves: the hidden math of a polar coordinate integration problem**

../notes/torus/2014-05-02talk/

polar coordinate arclength problem from Calc2 leads to Fourier analysis on the unit circle and spherical harmonic analysis on the unit sphere, for music, electronic wavefunction states, the cosmic microwave background temparature anisotropy

- 2013-nov-11 Malvern Prep talk

**dr bob: Mathematician? Physicist? How did I get here? What do I do?**

../notes/torus/2013-11-04talk/

- 2012-oct-26 Villanova University Physics Dept

**Abraham, Lorentz, (Poincare), Fermi and Gauss (and a whole lot of others): classical electromagnetic mass, a pedagogical example**

../notes/misc/EM-mass/

- 2012-apr-19 Villanova Outstanding Faculty Research Award talk

**General Relativity, Cosmology and Pasta? a life of USA-Italy academic commuting**../notes/torus/2012-04-19talk/

- 2011-nov-18 Villanova University Physics/Astro Debate

**gravity orbits and donut geodesics: the same problem nicely handled by Maple**../notes/torus/2011-11-talk/

- 2011-nov-19 Villanova University Outstanding Faculty Research lunch talk

**My life combining differential geometry, general relativity and Italy**

2011 Faculty Research Award lunch talk; prop; pics

- in progress

- 2000 Centrifugal Force Around Black Holes: Much Ado About Nothing? -- Shakespeare or Yo! What's the Big Deal? --South Philly (for a general audience)