Travel pillows are good for more than just long airplane rides. Choose one that is easily packable, will stay in place around your neck (with a clip or snap closure), is machine-washable, and is comfortable for the way you like to sleep. Keep in mind that over-the-ear headphones might not work well with taller travel pillows.

Fact

The skin contributes to about 15% of your body weight.

Myth

Earth is the only planet with water.

Of course, we have yet to find any intelligent life living off interstellar water, but H2O isn’t unique to Earth. Dark streaks that change on Mars suggest there isn’t just ice on the Red Planet—liquid saltwater likely flows on it. What’s more, NASA discovered that beneath a layer of ice on Jupiter’s moon Europa, there’s an ocean containing twice as much water as we have on Earth.