Cosmologists have an embarrassing problem: we don’t know what shape the universe is. The cosmos has three possible geometries—positively curved like a sphere, flat like an infinite plane or negatively ...

If the eyes are the window to the soul, then your brows are the curtains that define your entire being. Hyperbolic, sure. But eyebrow shapes are sneakily one of the most important features to consider ...

Pupil shapes vary widely across the animal kingdom, from the W-shaped pupils of cuttlefish to the bar-like pupils of goats. But why are animal pupils shaped so differently? When you purchase through ...