Wednesday's Best Bets on TV

“Hunting the Hidden Dimensions” (8 p.m. PBS): Math whizzes try to decipher the rules that govern fractal geometry. It’s TV for smart people.

“Coolio’s Rules (10 p.m., Oxygen): Just when you thought TV programmers had run the gamut of celebrity-driven reality shows, comes “Coolio’s Rules.” It focuses on the life and times of the hip-hop star, who, in the opener, tries to launch a catering business.