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The people we associate with can have a powerful effect on our behavior --for better or for worse. This holds true for human health and body mass, too. The heavier our close friends and family, the heavier we are likely to be

(PhysOrg.com) -- Some chemical elements appear much more abundantly in nature than others, which is partly due to how the elements originally formed. Scientists know that the light elements (hydrogen, deuterium, helium, and traces of lithium) were produced by fusion in the early Universe. Today, lithium, beryllium, and boron are constantly being produced in cosmic rays, while the heavier elements (up to iron) are formed by fusion in stars.

We see it all the time on shows like Bones and CSI. Skeletal remains can yield all sorts of clues--gender, age, past physical traumas

Most people know two things about helium. One is that it makes your voice comically high-pitched when you inhale it; the other is that it is extremely light, which is why balloons filled with the stuff float upward through the heavier air. But in particle physics terms--and especially when it comes to the nuclear physics of antimatter--helium is no lightweight.