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The human body is amazing. In approximately forty short (or long!) weeks, an egg the size of a grain of sand develops into a newborn baby. New research has shown this egg isn't a passive participant, but rather selects the strongest sperm for fertilization, further demonstrating the miracle of our body's wisdom.

Whether you're already a mom or hoping to be someday, pregnancy is a fascinating subject. Perhaps its the mystery of life that makes it so intriguing, but even scientists are continuing to discover incredible information about how our bodies grow life.

Think you already know it all? We bet you still have at least a couple things to learn.