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22-Dec-2015 01:12

And here's the tricky part: each and every sperm is one of a kind, carrying a unique genetic package. How can one person produce so many different combinations of genes?

But as ordinary as it seems, creating a new human being is no simple feat. No matter who you are, once upon a time you looked like this.

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A sequel to one of the most popular NOVAs of all time, "Miracle of Life," this Emmy Award-winning program tracks human development from embryo to newborn using the extraordinary microimagery of Swedish photographer Lennart Nilsson. Whether we're thinking about it or not, our bodies want to make babies. Around the world about 365,000 new babies get made every day.

It may be the last thing on his mind, but this man's body is working toward this.

We're uncovering the most intimate details of how life is created, the secrets behind life's greatest miracle.

You might think all the people on this beach are just working on their suntans.

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If you're a bacterium, you might be into cloning—making exact replicas of yourself. With sexual reproduction, two individuals each provide some DNA. If the two can get together, a new being will be created, one that's different from its parents and everybody else. And when it comes to survival of the fittest, variety has a definite advantage. Sexual reproduction may be popular, but it's also quite tricky. Inside all this tubing, the average man is churning out a thousand new sperm every second.

All your descendents have the same DNA and, except for an occasional mutant, are just like you. To get an idea of how tricky, just take a peek inside a man's testicle. That's about a hundred million new sperm every day and more than two trillion over a lifetime.

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