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By measuring the shape and size of the bones in dinosaur and reptile eye sockets, scientists say they've determined which animals hunted by night. Flying pterosaurs were largely day-living, while velociraptors stalked their prey by night.

The National Park Service is warning surfers, snorkelers and swimmers that it's the great white shark birthing season off the California coast and the creatures are making their presence known as they attack seals.

The planet, Kepler-10b, is 1.4 times the size of Earth and the smallest planet discovered outside our solar system. Though the planet is far too close to its star to harbor life, the finding holds promise for future planetary discoveries using the space telescope.

The Department of Homeland Security was established in 2002 with the idea of unifying homeland security efforts. But after all this time, have those efforts made us safer?

Is America safer today than it was a decade ago? The U.S. now spends more than $70 billion a year on homeland security efforts. The authors of a new book argue that the terrorist threat is too small to justify that level of expense.

Though dinosaurs died out 65 million years ago, there are still thought to be a few species left over from those days. Plants called cycads, the so-called "living fossils," have remained mostly unchanged for 300 million years. But a new study suggests that glamorous title may not be deserved.

Daniel Kahneman won a Nobel Prize in 2002 for his work on the psychology of decision-making. Now, in Thinking, Fast and Slow, Kahneman revisits and recasts his world-famous research on what he calls "the machinery of the mind."

Airs Wednesday, April 28, 2010 at 8 p.m. on KPBS TV

Airs Friday, July 26, 2013 at 9 p.m. on KPBS TV

A physicist's photographs show snowflakes in a dazzling variety of shapes — from minimalist cylinders and spiky rods to stylized Art Deco and the familiar lacy Baroque.