Why do men have nipples? That strange bodily question has baffled so many that it even has become the title of a book by Mark Leyner and Billy Goldberg. Interestingly, solving this puzzle has more to do with understanding your embryonic development than your evolutionary past.

Click the link below and watch the video above to get to know your nipples. And don't forgot to sound off in the comments section below. Come on, talk nerdy to me!


See all Talk Nerdy to Me posts.
Like Cara Santa Maria on Facebook.
Follow Cara Santa Maria on Twitter.

Also on HuffPost:

Loading Slideshow...
  • What atoms combine to make up a molecule of water?

    A. 1 hydrogen, 1 oxygen B. 1 hydrogen, 2 oxygen C. 2 hydrogen, 1 oxygen D. 2 hydrogen, 2 oxygen 54% got it right

  • Medium (54.24% Correct)

    Which characteristic is shared by all cells? A. They need energy. B. They reproduce sexually. C. They make their own food. D. They move from place to place.

  • Medium (52.52% Correct)

    Water evaporates and falls back to Earth as rain or snow. What is the primary energy source that drives this cycle? A. The wind B. The Sun C. Air pressure D. Ocean currents

  • Easy (74.48% Correct)

    Kelly slides a flat rock across the smooth ice of a frozen pond. The rock slows down after several seconds. What causes the rock to slow down? A. The thickness of the ice B. The temperature of the air above the ice C. The force of friction between the ice and the rock D. The gravitational force between the ice and the rock

  • Medium (51.12% Correct)

    Which layer of Earth is divided into plates? A. Mantle B. Crust C. Inner core D. Outer core (Photo by David McNew/Getty Images)

  • Easy (68.97% Correct)

    Why do mountain climbers at high elevations use oxygen tanks to help them breathe? A. At high elevations the ozone layer draws oxygen out of the atmosphere. B. The atmosphere is less dense at higher elevations so there is less oxygen available. C. Oxygen is heavier than the other gases in the atmosphere and sinks to lower elevations. D. Radiation from the Sun splits oxygen molecules into atoms making the oxygen unbreathable. AFP PHOTO / JEAN-PIERRE CLATOT

  • Easy (73.99% Correct)

    The surface of the Moon is covered with craters. How were most of these craters formed? A. By eruptions of active volcanoes B. By impacts of many meteoroids C. By shifting rock on the Moon's surface (moonquakes) D. By tidal forces caused by Earth and the Sun

  • Medium (44.87% Correct)

    Three funnels were filled with equal volumes of pebbles, fine sand, and coarse sand. The same amount of water was poured into each funnel. Which correctly lists the order in which the water passed through the funnels, from fastest to slowest? A. Pebbles, fine sand, coarse sand B. Pebbles, coarse sand, fine sand C. Fine sand, coarse sand, pebbles D. Coarse sand, pebbles, fine sand

  • Medium (56.29% Correct)

    Household appliances convert electricity into one or more different forms of energy. An electric fan can best be described as converting electricity into A. heat energy only B. heat energy and sound energy only C. heat energy, sound energy, and mechanical energy only D. heat energy, sound energy, mechanical energy, and chemical energy (Photo by Tim Boyle/Getty Images)

  • Medium (47.54% Correct)

    An unusual type of fossil clam is found in rock layers high in the Swiss Alps. The same type of fossil clam is also found in the Rocky Mountains of North America. From this, scientists conclude that A. glaciers carried the fossils up the mountains B. the Rocky Mountains and the Swiss Alps are both volcanic in origin C. clams once lived in mountains, but have since evolved into sea-dwelling creatures D. the layers of rocks in which the fossils were found are from the same geologic age AFP PHOTO / ED JONES

  • Hard (17.36% Correct)

    What two gases make up most of the Earth's atmosphere? A. Hydrogen and oxygen B. Hydrogen and nitrogen C. Oxygen and carbon dioxide D. Oxygen and nitrogen (Photo by NASA TV/Getty Images)

  • Hard (35.5% Correct)

    A person produces two sound waves with a flute, one immediately after the other. Both sound waves have the same pitch, but the second one is louder. Which of the following properties is greater for the second sound wave? A. Frequency B. Amplitude C. Wavelength D. Speed in air AFP PHOTO/Indranil MUKHERJEE

  • Medium (42.01% Correct)

    A human CANNOT survive the loss of which of the following? A. The appendix B. The liver C. A lung D. A kidney AFP PHOTO / ATTILA KISBENEDEK

  • Hard (34.94% Correct)

    Which of the following is an example of genetic engineering? A. Growing a whole plant from a single cell. B. Finding the sequences of bases in plant DNA. C. Inserting a gene into plants that makes them resistant to insects. D. Attaching the root of one type of plant to the stem of another type of plant. AFP PHOTO / Juan Mabromata

  • Hard (37.3% Correct)

    All of the following are examples of erosion EXCEPT: A. The wind in the desert blows sand against a rock. B. A glacier picks up boulders as it moves. C. A flood washes over a riverbank, and the water carries small soil particles downstream. D. An icy winter causes the pavement in a road to crack. AFP PHOTO/STR

  • Hard (26.84% Correct)

    Why does the leaf of a plant look green? A. Because it absorbs green light B. Because it reflects green light C. Because it absorbs only yellow and blue light D. Because it reflects a mixture of yellow and blue light AFP PHOTO/Yasuyoshi CHIBA