■ Talk: 'The Cosmic Distance Ladder'
UCLA mathematics professor and Fields Medal winner Terence Tao gives a free talk at 7:30 p.m. tomorrow (Oct. 6) on methods of measuring distances from Earth to the sun and moon, and in places more remote. The event is in Cubberley Auditorium at Stanford University. For more information, go to math.stanford.edu.
■ Exhibition: 'Celebrating Mexico'
A new exhibition at Stanford University's Green Library marks the bicentennial of Mexico's independence with a display of books, photos, movie posters, manuscripts, postcards and other materials. The exhibition is up through Jan. 16, open during library hours, in the Bing Wing. Call 650-725-1020 or or go to library.stanford.edu.