Today is the first day of Nobel week, where each day a different Nobel Prize winner will be announced. Today's prize is Medicine and the winner is Robert G. Edwards, the man behind in-vitro fertilization. Edwards was the first doctor to fertilize an egg with sperm outside the human body, and then reinsert the fertilized egg into the woman. The first baby fertilized this way, Louise Brown, was born in 1978 and is known as the first "test-tube baby." Today, more than 4 million pregnancies have been created using Edwards's method.