1. At their closest point, Russia and the U.S. are only 4 km (2.5 miles) apart.
2. We share 70% of our DNA with slugs.
3. Butterflies taste with their feet.
4. All clams are born male and can change to become female later in life. However, once they do, they cannot change back.
5. The muscles in our tongue, the tentacles of an octopus and the trunk of an elephant are all structured the same way.
