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In some African-American girls, puberty begins earlier, at about age 9, meaning that puberty occurs from ages 9 to 14.

Adolescent girls reach puberty today at earlier ages than were ever recorded previously.

Puberty involves a series of physical stages or steps that lead to the achievement of fertility and the development of the so-called secondary sex characteristics, the physical features associated with adult males and females (such as the growth of pubic hair).

While puberty involves a series of biological or physical transformations, the process can also have an effect on the psychosocial and emotional development of the adolescent. Puberty usually occurs in girls between the ages of 10 and 14, while in boys it generally occurs later, between the ages of 12 and 16.

To unlock their secrets, David Pogue, technology columnist and lively host of NOVA's popular "Making Stuff" series, spins viewers through the world of weird, extreme chemistry: the strongest acids, the deadliest poisons, the universe's most abundant elements, and the rarest of the rare—substances cooked up in atom smashers that flicker into existence for only fractions of a second. Yet everything we know, the stars, the planets and life, itself, comes from about 90 basic building blocks,… …all right here, on this remarkable chart: the periodic table of the elements. And we're made, almost entirely, of just a handful of ingredients, including one that burns with secret fire inside us all. The sample, mixed with a lead oxide powder, goes into a furnace heated to 2,000 degrees. Using extreme heat, gold atoms are gradually coaxed away from the powdered rock. Turns out that an ounce per ton is pretty much optimal for the underground mine. The New York Mercantile Exchange is a vital hub in the global metals market, which is pretty good news for me. (Commodities Trader): Oh, this is an old, old business. It's so important that the rise and fall of copper prices provide a snapshot of the health of the entire world economy. Each atom gives up some of its electrons to create a kind of sea of these randomly moving charged particles.

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