astrophysicist at the hubble space science institute and the author of brilliant blunders. let's start there. why blunders? why are they productive? what was the goal of the book? >> so there were three goals to the book. one is to make us all feel a little bit better. namely that even the biggest geniuses make some serious blunders. second is to correct the misconception that some people think that science marches on a straight line from a to b when in fact it is really a zig zag path that encounters many, many blunders. and third to convey this notion that if you want to think outside the box, be prepared to meet some blunders along the way. >> chars darwin didn't know any genetics and we cannot blame him