1. We all spent the first 30 hours of our lives as a single cell. 2. Babies born with teeth are rare - only 1 in 1000 by the highest estimates. 3. Some 6 per cent of people have an extra nipple. They tend to occur on the left side of the body and are more common in men. 4. Each day your blood travels a total of 19,000 kilometres - half the circumference of Earth. 5. Messages travel along the fastest neurons at 400 kilometres per hour - faster than a Formula 1 racing car. 6. A handful of people go through life with no fingerprints, thanks to a rare gene variant, a condition dubbed immigration delay disease.
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