actually damage sperm, they may actually cause the sperm to go through these de novo dna damage, and that s what ultimately may lead to this autism spectrum problem. at least in about 20% of the cases. jenna: it s interesting to also note that some of those mutations that are inherited, people may have them, and they may not be harmful. and that s something else to point out. we re going to have to leave it there, unfortunately, doctors. it s nice to have both of you here. it s a story we re going to continue to watch. thank you so much. thank you. thank you. jon: some new troubles for the nation s housing market. some experts are predicting even more foreclosures this year than there were two years ago. why? and what it means for the struggling housing market as well as the economy as a whole. that s coming up. [ female announcer ] water was meant to be perfect.