crohn s disease, et cetera. start at 45 to 76 for most people. get screened with a colonoscopy or there are other tests, ages 76 to 85, talk about whether you should be getting screened. all right. some good advice and guidance. thank you. it is the top of the o hare on cnn newsroom. i m bianna golodryga. i m victor blackwell. good to be with you. president biden has finally addressed the national security mystery tens of thousands of feet in the skies. the three unidentified flying objects american fighter jets shot down last weekend. a move never seen before from the u.s. military. he spoke after days of bipartisan calls that he should share more with the american people about the concerns. the president says his experts do not think the aerial objects are chinese spy balloons like the one brought down off the coast of south carolina. he added the best guess since no debris has yet been recovered is that the mystery objects are tied to private research. i want t
families of families may have settled for more. there seems to be a cost benefit analysis and that s borne out on the brakes of these trains. it was almost two miles long with brakes from the civil war, from 1860s that brake from front to back. for nears there s been an improved system that s electronic that brakes all the cars at one. norfolk southern and many in the industry naught adaptation fought this adaptation for flannelable cars, and it was rolled back by the trump administration. and the biden administration is saying that norfolk southern will be held accountable for this incident, as well. what can you tell us about the chemicals specifically that were on this train? reporter: this is the sort of witch s brew of a bunch of different chemicals together, vinyl chloride is the one that got all the attention. that was the one that they intentionally burned off days after the crash. it s what you find in pvc pipes. during the wildfires in paradise, california, years ago, t