The story of how the soviets came up with a pen that would write in space is almost entirely false. The true story was it they had these kind of fancy mechanical pencils that cost much more than a regular pencil. But to me, there's a second layer of a lesson here, which is that a pencil seems to be of simple technology, but fact,. There's a very famous essay called 'i pencil' explaining that no one person knows how to make a pencil. And if that is true, there are many, many reasons we're going to take the diet coke out of the fridge or stand up and raise our hands - you don't have to guess by 90