Imagine you hear about a charity that saved one child from hunger—you feel proud and want to donate. Then you hear they saved 10,000 kids—but your reaction feels almost the same. Or you read a story about one dolphin rescued from an oil spill and feel really moved, but hearing about rescuing 5,000 dolphins doesn’t feel much more powerful. Why does your heart respond similarly to very different numbers? Take the quiz to find out what’s really going on here.