Fun Fact Friday (#61)

Fun Fact Friday is a meme hosted by Lettora at I’m Booked! If you’d like to join and do your own Fun Fact Friday, just ask! At I’m Booked! Every week we’ll give you five new, fun facts.
This week’s five facts:

1.  The sword-billed hummingbird is the only bird with a beak longer than its body.

2. The word "nice" used to mean "foolish, stupid, senseless."

3. For every grain of sand on every beach on Earth, there are 10,000 stars in the universe.

4. Over half of the world's population is under 30 years old.

5.  Most of Antarctica is covered in ice: less than 1% is permanently ice-free.