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We belong to a remarkably quirky species. Despite our best efforts, some of our strangest foibles still defy explanation. But as science probes deeper into these eccentricities, it is becoming clear that behaviours and attributes that seem frivolous at first glance often go to the heart of what it means to be human.

1. Blushing

2. Laughter

3. Pubic hair

4. Teenagers

5. Dreams

6. Altruism

7. Art

8. Superstition

9. Kissing

10. Nose-picking