have a waste product called oxygen and overtime the oxygen bulbous photosynthesis became so successful and so many organisms spread around the globe. over time the bubble grew until they reached the point of remarkable stabilization which is a whole other scientific story of about 20% and this was initially the world's greatest pollution crisis. oxygen is a deadly chemical so there's all these organisms that died without oxygen and was a horrible but to real holocaust but over time organisms evolved lifting of oxygen and lived because of this invention of air and millions of years ago as an accidental byproduct of photosynthesis and that is what joseph priestley was seeing here but what is wonderful about the story is he didn't fully realize it. he knew there was something interesting happening so what he did is he started writing letters to his friends about it and one of the first people he wrote was benjamin franklin and what's great about doing research in this book and i hope this comes across in reading it is so much of these conversations are preserved in the correspondence and

. >> i was thinking about the science of photosynthesis. hopefully, that is the correct term -- [laughter] going back to my scientific days. from being able to get outside in the fresh air and work to growing that food and learning the science of that process is remarkable. i will certainly look to denver but every business i have talked to jump at the opportunity of getting out and helping from equipment owners to farm bureau of folks. >> there is another reason to do this for governors. in addition to the nutrition and education issue, if you are looking at the future of this country and looking at the future economy in this country, there's no question that biology will be extraordinarily important in our future. the bio-based economy is rapidly expanding and creating new opportunities in rural areas particularly. if justice have a better understanding of how food is produced, they will understand that agriculture is something that is unique, and exciting, challenging and we will get more people -- more young people getting engaged in sc

. >> i was thinking about the science of the photosynthesis.if are a mirror, hopefully that's the correct term, remembering back to my scientific base. but i think being able to get outside in the fresh air and trying to work, growing of food, to learning the science of that process is just remarkable. i'll certainly look to denver but every business that i talk to has jumped at the opportunity of getting out and helping from equipment owners to farm bureau. >> if i can add just a point to this, and there's another reason to do this for governors. and it's in addition to the nutrition issue, in addition to the education issue. and that is, if you're looking at the future of this country and you are looking at the future economy of this country, there's no question that biology is going to be extraordinarily important in our future. and that the bio economy, bio-based economy is rapidly expand and creating new opportunities, particularly in rural areas. so youngsters if they have a better understanding of how food is produced, they will understa