HARD WORKING HEART The heart is the hardest-working muscle in the body. Every day, it creates enough energy to drive the semi-truck over 18 miles(30 kilometers). Over the lifetime time it is equal to driving to the moon and back. AMAZING BRAIN The brain is 60% fact, but it still works hard. At any given time, your brain can generate up to 25 watts of power, which is enough to power a light bulb. EYES If the eyes were digital, they would have 576 megapixels. The eye can distinguish about 10 million colours. FAST SNEEZE The typical human sneeze can travel at just under 40mph (64 km/h). That's the speed of a tiger. GROWING HAIR Your hair grows nearly one-quarter of an inch ( 6millimetres) every four weeks. Hair keeps on growing for 6 years. The hair then falls out, an...