Common in the US, rare in Europe and now championed in Africa, male circumcision is hotly debated. Are the gains worth the loss?
No, this isn't footage from a particularly grotesque alien invasion film. It's stroboscopic footage from a laryngoscopy, showing us what the human vocal cords look like in action.
Scientists have discovered that shorter people burn more energy when they walk than tall people do. By measuring how people of various heights and ages walk, researchers discovered something odd: We all walk the same way, regardless of height. In other words, if you scaled a five-year-old up to adult height, their…