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The problem that the sewage treatment plants are having is not the wipes that are designed and marketed to be flushed that pass the guidelines to be flushability. those are not causing the problem and they're less than 10% of the wipes sold. >> how can you say that definitively? >> because we have developed a set of flushability assessment guidelines scientifically that measure seven different properties of fabrics that are designed to disdenagrate. >> so you're confident that the things being sold as flushable are fine, it's user error. people are flushing wipes not marketed to be designed to...

Also have an air safety expert. if these pings are not coming from flight 370, what else could explain them? >> well, really it's anyone's guess and we will probably never know. there are a lot of things in the ocean that make a lot of nois. this is a very artificial sounding noise so it boggles the imagination that something natural could create it. but we just don't know, really what could cause a false positive. we do know that there have been numerous false positives so far. it is very much in up in the air. >> the science tries to avoid this, the 37.5 kilohertz is a frequency not heard in...

friend of the family and of little etan's and in fact had been in that basement with him just the day before. so authorities hoped they can find some evidence that etan was down there. they have a search warrant, and they're trying to see where the evidence will lead them if they find any. >> it's been so long, susan. was this case kept open in part because the milk carton factor or is it common for a 33-year-old missing person's case to get this much police attention? >> reporter: well, certainly the case of etan patz was one of the very first, his case, feech ared on milk cartons w...

Some of them? how safe really is this energy? >> well, i think you really nail td 0 at the outset. any energy carrier, any fuel has intrinsic dangers. hydrogen, i'm excited about it, because it has a lot of potential benefits. in contrast to gasoline, which we're all familiar with, hydrogen is intrinsically nontoxic and it doesn't pool on the ground, it doesn't accumulate in that way. it's 15 times less dense than air. and it has very clean byproducts, as you mentioned, any of the sort of traditional fuels that we work with day to day, whether it's powering our car or even have egg little buta...

Injuries, burns, pigment changes, blistering of the skin, redness of the skin. >> reporter: she is careful and at a price of $500, she's still smiling. >> i'm sure the lasers in a doctor's office are much more expensive than $500. this is $500 forever. like not $500 a visit. >> unless you think the $500 price tag is scaring people away, it sold out on qvc's debut and sold out at nordstrom.com. >> three to four minutes a day for a month and that's enough to notice a pretty significant difference, though. i'd be scared someone would hit their eye. seems like something at home can go wrong a lot....