Researchers cracked a 50-year-old math problem scribbled by Richard Feynman over lunch. The equations show that humans are better decision-makers than scientists once thought.

Despite dozens of experiments over the years, scientists still don't have a precise measurement for gravity's strength. Why is that?

Physicists used quantum bits to achieve "perfect randomness" in a world-first experiment. The results of their research could strengthen cryptography and other security systems.