A human being weighing 70 kilograms contains among other things: -45 litres of water -Enough chalk to whiten a chicken pen -Enough phosphorus for 2,200 matches -Enough fat to make approximately 70 bars of soap -Enough iron to make a two inch nail -Enough carbon for 9,000 pencil points -A spoonful of magnesium I weigh more than 70 kilograms. And I remember a TV series called Cosmos. Carl Sagan would walk around on a set that was meant to look like space, speaking in large numbers. On one of the shows he sat in front of a tank full of all the substances human beings are made of. He stirred the tank with a stick wondering if he would be able to create life. He didn’t succeed.