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Wanted to know more. father held from iraq wants to know. how do scientists determine the chemical composition of faraway stars. by the one thing i met split into its color components light forms a continuous spectrum. when light impinges on atoms or molecules a portion of it is absorbed that create black lines a distinct frequency. in some ways it's like a fingerprint. all the elements in a store leave their fingerprint in the light spectrum that it emits. these spectra can differ greatly that's because the cocktail of elements that make up a star changes. over time. this is what the spectrum...

It has to purchase the emissions rights for every turn of c o two it emits. the industry says that undermines its international competitiveness. over the last seventeen years steel makers have managed to use technology to cut c o two emissions by a full nineteen percent. partizan trip technicians say that's the limit. so the notion of using c o two is a raw material comes just at the right moment. for the principle advantage of this technique is that it enables us to secure the future of the european steel industry to be daughter says you're going to see on top of that there are fifty steel pl...

A vulnerable plant that's found only on one island. the island of sumatra. and because of the size of the plant and the odor it emits, most people don't want to grow it in their home. it's usually only found in botanic gardens or university collections. >> so we don't have smell-a-vision on the show yet. tell me what it smells like and i presume it has something to do with the name. >> well, yeah, we had a lot of visitor comments about the odor. everything from, you know, dead rats or dead mice to hamburger that's been forgotten and left out too long. we did have a policeman and a mortician vi...

Have a right to do what we want to do. if we want to smoke those things, we're going to smoke them. now, can i smoke my cigars in here. >> from a business standpoint, do you think companies are having to wrestle with this in the hr department, what is the difference between vaping, which is a weird word, but that's what they call it, and selling gun. >> vapeing. >> i'm guessing this is where it comes from. not that the vapor, which is a form of water vapor, right, that is the problem. it's what is happening is a lot of people, not only kids, people are retooling these e-cigarettes to put weed ...

Right to do what we want to do e and if we want to smoke those things, we're going to smoke them. can i smoke mymy cigars in here? >> i actually think from a business standpoint, do you think companies are having toins wrestle with this in the hr department, to think about what, is the problem if it is just -- what's the difference between vaping, which is a weird word, and chewing gum? >> i'm guessing this is where it comes from. not that the vapor, which is aic form ofh water vapor is the problem, it's what's happening is a lot of people are retoolint these e cigarettes to put weed in them. ...