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What I want to do in this video is kind of introduce you to the idea of, one, how carbon-14 comes about, and how it gets into all living things. They can also be alpha particles, which is the same thing as a helium nucleus. And they're going to come in, and they're going to bump into things in our atmosphere, and they're actually going to form neutrons. And we'll show a neutron with a lowercase n, and a 1 for its mass number. And what's interesting about this is this is constantly being formed in our atmosphere, not in huge quantities, but in reasonable quantities. Because as soon as you die and you get buried under the ground, there's no way for the carbon-14 to become part of your tissue anymore because you're not eating anything with new carbon-14.

And then either later in this video or in future videos we'll talk about how it's actually used to date things, how we use it actually figure out that that bone is 12,000 years old, or that person died 18,000 years ago, whatever it might be. So let me just draw the surface of the Earth like that. So then you have the Earth's atmosphere right over here. And 78%, the most abundant element in our atmosphere is nitrogen. And we don't write anything, because it has no protons down here. And what's interesting here is once you die, you're not going to get any new carbon-14. You can't just say all the carbon-14's on the left are going to decay and all the carbon-14's on the right aren't going to decay in that 5,730 years.

But what's interesting is as soon as you die and you're not ingesting anymore plants, or breathing from the atmosphere if you are a plant, or fixing from the atmosphere. Once a plant dies, it's no longer taking in carbon dioxide from the atmosphere and turning it into new tissue. And this carbon-14 does this decay at a specific rate. And you say, hey, that bone has one half the carbon-14 of all the living things that you see right now.

And then you can use that rate to actually determine how long ago that thing must've died. It would be a pretty reasonable estimate to say, well, that thing must be 5,730 years old.

Duncan posed with his plus one, both looking smart in shirts and slacks.

The boyfriend - of whom very little is know, including his name, age and where he met Duncan - grinned for the camera, sporting a pair of shades.

Tragedy struck when he lost his brave battle at the Rechts der Isar Hospital, Munich on February 21, 1958.

** WARNING -- VIDEO CONTAINS TIM DUNCAN SAYING A CUSS WORD** The San Antonio Spurs PARTIED LIKE CHAMPS hours after they were eliminated ...

On Wednesday afternoon, he told the Loose Women panel that he had been afraid to come out as gay as he was afraid of the reaction from his family, friends and fans.

Will returned expense various objects that are not within the frame of this research, i have line come to know successfully date younger women.

His usually red and white carnation drenched gravestone in Dudley Cemetery sums up the town's tragic loss.

And that evening Duncan James showed that he has truly buried those fears as he stepped out for the first time in public with his new boyfriend.

The Blue singer-turned-Hollyoaks actor, 39, showed up at the launch of Camden's newest hotspot Gabeto restaurant looking very cozy with his tall, dark and hunky companion.




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