If a piece of metal is heated to a high enough temperature, it will emit light in a process known as incandescence.If an astronaut were to float freely in space without a spacesuit, their body fluids would boil due to the lack of atmospheric pressure.If you were to unravel all the DNA in your body, it would stretch from the Earth to the Sun and back over 600 times.If you were to remove all the empty space between the atoms in your body, you would be compressed into a tiny speck the size of a grain of sand.If you were to travel at the speed of light, time would essentially stand still for you relative to the rest of the universe.If you were to zoom in on a human cell to the size of a football field, you would be able to see individual molecules at work within it.