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Money-saver for parents everywhere. after a relatively minor impact, the mother can't hold on. another critical tip, generally sitting within five rows of an exit gives a passenger the best odds because getting out fast is key. lessons from an aviation disaster that may actually save lives. neal karlinsky, abc news, detroit. back of the plane, safest place to be. people complain, "i don't want to be near the bathroom." i would rather be alive end of the day if something goes wrong. >> your chances according to worldwide data dying in a plane crash in a fully developed country, one in 14 mill...

On the laps of the passengers behind them with their legs up in the air. >> reporter: not aviation experts. >> i've never seen anything like that in all my years, 30 years of covering the airline industry. >> reporter: no one can remember airline seats disconnecting from the cabin floor. and now it's happened twice in three days aboard two american airlines 757s. >> during climb-out, rows -- passenger seats, row 12-d, e, f came loose out of the floor. >> reporter: flight 685, boston to miami, diverted in mid flight declaring an emergency, landing at jfk in new york because a row of seats had d...

Ultimate terror, a sudden, horrifying crash. this stunning made-to-order catastrophe was done for the discovery channel show "curiosity plane crash." all to better understand what really happens to people on board. >> we'll see maybe a broken ankle. >> reporter: injury biomechanics expert dr. cindy burr says the crash dummies tell the story. bracing for impact can save your life. what should you do? put your head -- >> put your head down. hands over. >> reporter: hands over your head? >> just pull it. >> reporter: that works? >> well, yeah, it does. >> reporter: the results show that passenger...