reporter: why, if he had died 12 hours earlier, would it have made any difference? because they wouldn t have found out. they would have marked the death certificate as death unknown. he would have been put in the ground, and it would have been just a mystery. unknown unknown assailants. turn the page, move on. it s the key of this murder. polonium 210 was discovered and now we know exactly sasha was killed by polonium 210. reporter: it s an almost perfect murder weapon. polonium has no smell, little taste, and without specialized equipment, it s undetectable. if you not looking particularly for polonium, you not able to discover it. do you know, it will be everywhere, but you don t know this. reporter: the amount that killed litvinenko, slipped into something he ate or drank, was no larger than a grain of salt. but that s still a thousand times the lethal dose. and that tiny bit of polonium would have been enormously expensive. $8 million to $12 million to
reporter: why if he had died 12 hours earlier, would it have made any difference? because they wouldn t have found out, they would have marked the death certificate as death unknown. he would have been put in the ground and it would have been just a mystery unknown unknown assailants. turn the page, move on. it s the key of this murder. polonium 210 was discovered and now we know exactly, sasha was killed by polonium 210. it s an almost perfect murder weapon. polonium has no smell, little taste, and without specialized equipment. it s undetectable. if you re not looking particularly for polonium, then you would not able to discover it. do you know? it will be everywhere, but you don t know this. reporter: the amount that killed litvinenko was slipped into something he ate or drank and was no larger than a grain of salt, but that s still a thousand times the lethal dose. and that tiny bit of polonium
and they were issued citations and could be charged for damages in the houses. a out of control fireworks display in tennessee. can you hear those pops? those ro the rockets that are going off as the fireworks store is erupting into flames. the store completely destroyed by the fire. the fireworks shot off in all n smaller fires nearby. a scare in the air after a woman collapses and stops breathing during a flight from new zealand to los angeles. the crew and a paramedic who happened to be on board at the time tried to save the middle aged woman for nearly 90 minutes but they weren t able to revive her. they were kept on the plane for two hours. the cause of the death unknown. four people in the boston area they have been stricken by a moscow born virus. the victims were diagnosed with a viral disease that is
one of them. two runners competing in this weekend s rock n roll half marathon in raleigh collapsed and died during the race. ems and medical personnel, they were immediately on the scene attempting to revive each runne participants in the race. their causes of death unknown. kathleen sebelius is now out of a job as health and human services secretary and she s now finally admitting the obamacare rollout was flawed. on meet the press, she even went as far to say the rollout goals were wrong. it was a team in place with other people, outside experts coming in, kicking the tires, regular reports, regular dashboards on the tech side. but clearly, the estimate that it was ready to go october 1st was just flat-out wrong. so was it her choice or the president s to step down? here s what she said when asked if the president tried to talk her out of leaving. well, it made it pretty clear