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Philadelphia's Police Commissioner Charles Ramsey is retiring at the end of the year. Under his watch, the murder and violent crime rates are lower than they've been in decades.

The wrestlers say World Wrestling Entertainment downplayed dangers in the ring.

Given two choices of attractive mates, female frogs pick the top vocalist. But add a third, inferior male to the mix, and females go for No. 2. The "decoy effect" shapes some human choices, too.

The demands: a U.N. apology for bringing the disease to the island, reparations for victims, repairs to the water system. Meanwhile, a study shows the toll is far worse than previously thought.

Commentator Barbara J. King digs into whether there's merit to fears of contracting the virus in the U.S. — and into humans' natural tendency, under certain circumstances, to panic.

A shrinking pool of grant money for medical research has led competing applicants to oversell weak scientific findings, critics say. The result: Many experimental treatments are worthless.

It's not enough anymore to learn how to size up the symptoms of a particular patient, say specialists in bioinformatics. Modern doctors need to learn to see patterns in huge data sets, too.

It's not enough anymore to learn how to size up the symptoms of a particular patient, say specialists in bioinformatics. Modern doctors need to learn to see patterns in huge data sets, too.

Airs Wednesday, March 9, 2016 at 8 p.m. on KPBS TV

It turns out the skulls have many layers of symbolism, from Mayan lore to modern-day issues.