Each year, about 400 people in the United States die from falling out of bed. Three hundred die in a bathtub. And almost three thousand people are killed by hippos each year. Which brings us to air travel. Last year, three billion people boarded a flight. And only 224 died in airline crashes. The lesson here is clear: Never sit in bathtub perched on top of a bed on a flight loaded with a herd of hippos. (You’re welcome.)