The Iraqi National Symphony Orchestra performs in Baghdad. The concert was promoted by word of mouth to avoid being targeted by bombs. Graham Smith/NPR hide caption

itoggle caption Graham Smith/NPR

James McAvoy and Jessica Chastain star in The Disappearance of Eleanor Rigby Him, Her and Them. Courtesy of The Weinstein Company hide caption

itoggle caption Courtesy of The Weinstein Company

"Earth outweighs us by a factor of over ten trillion," Munroe writes. "On average, we humans can vertically jump maybe half a meter on a good day. Even if the Earth were rigid and responded instantly, it would be pushed down by less than an atom's width." Randall Munroe/Courtesy of Houghton Mifflin Harcourt hide caption

itoggle caption Randall Munroe/Courtesy of Houghton Mifflin Harcourt

Apples and Cakes (Pommes et gateaux) by Paul Cezanne, 1873-1877. Christie's Images Limited/Courtesy of the Barnes Foundation hide caption

itoggle caption Christie's Images Limited/Courtesy of the Barnes Foundation