1.  First we thought that only humans use tools.

2.  Humans use sonar to navigate, fish, hunt for shipwrecks and detect quiet modern submarines.

3.  Humans also use the hippocampus to acquire and store so-called declarative memories, involving all the events with which a person is involved during waking hours.

4.  Humans are already using these therapies and so we don't have to spend as much time examining what the molecules do in mice.

5.  Humans use stereotypes to make decisions.

6.  It appears early migrating modern humans used sex and whatever passed for drugs and rock 'n' roll back then to overcome their more powerful kissing cousins.

7.  It was the first metal used by humans.

8.  Other research suggesting that humans may use the armpit effect include studies in small, closed religious groups showing that people tend to avoid marrying genetically similar people.

9.  The gestures and postures humans use to send this message are shared with other mammals, particularly primates.

10.  The humans even use flying dinosaurs as aircraft.