The 2008 Nobel Prize in Chemistry went to a technique called Glowing Protein Work. A few months ago, a researcher used that technique to highlight individual sperm cells and demonstrate that sperm of a feather flock together.
And today, researchers, who are as obsessed with semen as you and I, applied the flourescent coloring techniqe to the stem cells that produce sperm. They learneda whole bunch of stuff, including the surprising discovery that sperm cells can revert back to stem cells — something previously thought to be impossible.
This new milestone in sperm research might lead to some big important discoveries. The holy grail for many scientists would be "the male contraceptive" or "something that you and I don’t care about."
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How a Man Produces 1,500 Sperm a Second (National Geographic)