It is the famous lightbulb-going-off story every school kid learns: How James Watson and Francis Crick discovered the structure of DNA, cementing their place in scientific history. But as William Brangham explains, a new book titled "The Secret of Life" paints a more troubling picture of how this famous discovery came about, and why scientist Rosalind Franklin also deserved credit. PBS NewsHour is supported by - https://www.pbs.org/newshour/about/funders