Theoretical physicist Francesca Vidotto on feminist epistemology, white holes, string theory, and her book (with Carlo Rovelli) on loop quantum gravity.

Does it explain why we’re having so much trouble sleeping?

The astrolabe was a revolutionary tool for calculating celestial positions and local time. The device's design dates back to Islamic antiquity.

Do we need two distinct conceptions of time, chronos (clock time) vs. kairos (real time), to understand Madeleine L’Engle’s classic novel?

The immensely popular podcast S-Town features some memorable sundial inscriptions. But where did the slightly morbid tradition come from?