Fun Fact Friday (#67)

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 Amazon River once flowed in the opposite direction, from east to west.

2.  Fossil evidence suggests that fish have been on Earth for about 530 million years.

3.  The Amazon River discharges 5 times as much water as any other river on the planet.

4.  Cat kidneys are so efficient they can rehydrate by drinking seawater.

5.  There's a restaurant built into a grotto in Italy.