linux, andc os, others that are smaller and more niche in their emphasis. peter: you mentioned that your fourth piece in this series was torvald.and linus who is that? craig: he is an amazingly bright as a college student in helsinki, finland, created a scratch,ot quite from but with the help of other people, and what he did was revolutionary. he called it open source. he did the first 100 things you needed to do right to make an operating system work, and then he said ok, world, send me your improvements and updates. the world did. hundreds of thousands of computer developers eventually were involved in creating this operating system. inreleased it to the public 1991 with about 10,000 lines of code. , and there are 19 million lines of code. he didn't write all of that. hundreds of thousands of people wrote all of that, but he threw all the years has managed this growth. it's kind of an amazing story. that atoperating system once manages to be very fast, very flexible. computerss can run -- can run on years for linux. millions of computers do. and it's free