It’s 11 PM. You’ve been at your desk since 4 PM. Your notes are highlighted in four colors, your phone has been “just checked” nine times, […]

You’ve noticed this during almost every monsoon storm: a flash of lightning streaks across the sky, and only after a gap of a few seconds does […]

Look up right now — actually, wait until evening for this one. If it’s a clear day, the sky above you is a bright, cheerful blue. […]

Introduction: Seeing Is Not Believing Look at the classic checker-shadow illusion: two squares on a checkerboard appear to be different shades of gray, one dark and […]