carl djerassi died in san francisco friday.was 91. >> brangham: a new study conducted by the pew research center found a large gap between what the public believes is dangerous and what scientists believe. for more about this, we are joined now from washington by lee rainie. he is the organization's director of internet, science and technology research. your survey showed some really dramatic gaps between what the general public and scientists believe about things like climate change and vaccines and scientific research. let's talk about some of those gaps. specifically about the food that we eat. you posed a statement that it's quote safe to eat genetically modified foods or gmos. 37% general public says it's safe whereas 88% of scientists said it was. on the statement, quote, it's safe to eat foods grown with pesticides 28% of the public agreed those foods were safe while 668% of scientists said they were. how do you explain that seeming chasm there? >> one of the striking things that has happened in our culture in the past c