How is it that Beethoven, who is celebrated as one of the most significant composers of all time, wrote many of his most beloved songs while going deaf? As Natalya St. Clair explains below, the answer lies in the math [...]

Shakespearean insults, mind-boggling numbers, universal mysteries, and microscopic battles — these topics are just hint of the intellectual expanse covered by the educators and animators in the top ten most viewed Lessons on ed.ted.com. Click any image to view the full Lesson.