9 'Unsolved' Mysteries That Have Been Solved


How Were the Pyramids Built?

For centuries people wondered how the ancient Egyptians were able to build the pyramids. In 2014, physicists determined workers could have hauled the blocks using sleds on water-moistened sand. Mark Brodkin Photography/Getty Images

Back in the late 1960s and early 1970s, proponents of the hypothesis that human civilization had been jump-started by extraterrestrial visitors pointed to the Egyptian pyramids as persuasive evidence. The ancient Egyptians could not have moved those massive multiton stone blocks with just muscle power, they argued, and suggested that alien anti-gravity technology was a more, uh, plausible explanation [source: Shermer].

Fortunately, in 2014, University of Amsterdam physicists materialized to rescue us from paperback pseudoscience. By analyzing an ancient tomb drawing, they figured out that a large team of workers could have hauled the giant stone blocks on a sled, and poured water on the sand in their path to reduce the friction and make it possible to drag the blocks to the pyramid [sources: Chowdury, Fall, et al.]. Other researchers also have suggested that the Egyptians used clay as a lubricant, and it may be that they used more than one method [source: Chowdury].

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  • Bayliss, Richard. "Sir John Franklin's last arctic expedition: a medical disaster." Journal of the Royal Society of Medicine. March 2002. (Feb. 15, 2015) http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1279489/
  • Blaszczak-Boxe, Agata. "Forensic science solves mystery of Richard III's death." CBS News. Sept. 14, 2014. (Feb. 13, 2015) http://www.cbsnews.com/news/forensic-analysis-of-richard-iii-death-solves-mystery/
  • Blumberg, Jess. "Abandoned Ship: The Mary Celeste." Smithsonian. November 2007. (Feb. 13, 2015) http://www.smithsonianmag.com/history/abandoned-ship-the-mary-celeste-174488104/
  • Chowdhury, Sudeshna. "Ancient Egyptians used wet sand to drag massive pyramid stones, say scientists." Christian Science Monitor. May 2, 2014. (Feb. 15, 2015) http://www.csmonitor.com/Science/2014/0502/Ancient-Egyptians-used-wet-sand-to-drag-massive-pyramid-stones-say-scientists
  • Fall, A., B. Weber, M. Pakpour, N. Lenoir, N. Shahidzadeh, J. Fiscina, C. Wagner, and D. Bonn ."Sliding Friction on Wet and Dry Sand." Physical Review Letters. April 29, 2014. (Feb. 15, 2015) http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.112.175502
  • Federal Bureau of Investigation. "The Black Dahlia Murder." Fbi.gov. Oct. 20, 2006. (Feb. 14, 2015) http://www.fbi.gov/news/stories/2006/october/dahlia_102006
  • Gasperini, Luca, etal. "The Tunguska Mystery--100 Years Later." Scientific American. June 30, 2008. (Feb. 15, 2015) http://www.scientificamerican.com/article/the-tunguska-mystery-100-years-later/
  • Gentry, Margaret. "Umbrella Man Not Sinister After All." Associated Press. Sept. 26, 1978. (Feb. 14, 2015) http://news.google.com/newspapers?nid=1298&dat=19780926&id=6wFOAAAAIBAJ&sjid=HowDAAAAIBAJ&pg=4995,3669986
  • Genzliger, Neil. "A Murder Mystery Thaws After 5 Decades in the Freezer." New York Times. Nov. 11, 2014. (Feb. 13, 2015) http://www.nytimes.com/2014/11/12/arts/footsteps-in-the-snow-solving-a-murder-after-55-years.html?_r=2
  • Gillis, Charlie and Sorenson, Chris. "Finding Franklin: How a 169-year-old mystery was solved." MacLeans. Sept. 13, 2014. (Feb. 13, 2015) http://www.macleans.ca/society/finding-franklin-how-a-169-year-old-mystery-was-solved/
  • Goode, Erica. "55 Years After Girl's Death, Her Killer Gets a Life Term." New York Times. Dec. 10, 2012. (Feb. 15, 2015) http://www.nytimes.com/2012/12/11/us/maria-ridulphs-killer-gets-life-55-years-after-her-death.html?_r=0
  • Gore-Langton, Robert. "The Campaign to Prove Shakespeare Didn't Exist." Newsweek. Dec. 29, 2014. (Feb. 14, 2015) http://www.newsweek.com/2014/12/26/campaign-prove-shakespeare-didnt-exist-293243.html
  • Hadingham, Evan. "Uncovering Secrets of the Sphinx." Smithsonian. Feb. 2010. (Feb. 14, 2015) http://www.smithsonianmag.com/history/uncovering-secrets-of-the-sphinx-5053442/
  • History.com "What Happened to Amelia Earhart?" History.com. (Feb. 14, 2015) http://www.history.com/topics/what-happened-to-amelia-earhart
  • Hogue, James. "Faking It: Anna Anderson." Time.com. (Feb. 14, 2015) http://content.time.com/time/specials/packages/article/0,28804,1900621_1900618_1900620,00.html
  • Jonsson, Patrik. "JFK assassination: Why suspicions still linger about 'Umbrella Man'." Christian Science Monitor. Nov. 22, 2013. (Feb. 13, 2015) http://www.csmonitor.com/USA/Politics/2013/1122/JFK-assassination-Why-suspicions-still-linger-about-Umbrella-Man
  • Lee, Adrian. "Solved: The Mystery of the Mary Celeste." University College London. May 20, 2006. (Feb. 13, 2015) http://www.ucl.ac.uk/news/news-articles/inthenews/itn060522
  • Maugh, Thomas II. "DNA testing ends mystery surrounding Czar Nicholas II children." Los Angeles Times. March 11, 2009. (Feb. 13, 2015) http://articles.latimes.com/2009/mar/11/science/sci-romanov11
  • McCoy, Terrence. "The metal fragment that could solve the mystery of Amelia Earhart's disappearance." Washington Post. Oct. 30, 2014. (Feb. 13, 2015) http://www.washingtonpost.com/news/morning-mix/wp/2014/10/30/the-metal-fragment-that-could-solve-the-mystery-of-amelia-earharts-disappearance/
  • National Oceanic and Atmospheric Administration. "What is the Bermuda Triangle?" Noaa.gov. Jan. 4, 2010. (Feb. 15, 2015) http://oceanservice.noaa.gov/facts/bermudatri.html
  • North America Bigfoot Search. "About Us." Nabigfootsearch.com. (Feb. 14, 2015) http://www.nabigfootsearch.com/background.html
  • Nickell, Joe. "The Bermuda Triangle and the Hutchinson Effect." Csicop.org. Sept. 2007. (Feb. 14, 2014) http://www.csicop.org/sb/show/bermuda_triangle_and_the_lsquohutchinson_effectrsquo/
  • O'Neill, Ann. "Taken: The Oldest Cold Case Ever Solved." Cnn.com. Aug. 2013. (Feb. 15, 2015) http://www.cnn.com/interactive/2013/08/us/oldest-cold-case/
  • Pendrick, Daniel. "The Devil's Triangle?" Pbs.org. (Feb. 14, 2015) http://www.pbs.org/wnet/savageseas/captain-side-bermuda.html
  • Redfern, Simon. "Mystery solved: meteorite caused Tunguska devastation." Arstechnica. June 27, 2013. (Feb. 13, 2015) http://arstechnica.com/science/2013/06/mystery-solved-meteorite-caused-tunguska-devastation/
  • Royal Museums Greenwich. "John Franklin's Last Expedition." Rmg.co.uk. (Feb. 15, 2015) http://www.rmg.co.uk/explore/sea-and-ships/in-depth/north-west-passage/exploration-adventure-and-tragedy/john-franklins-last-expedition-1845
  • Shermer, Michael. "The Skeptic Encyclopedia of Pseudoscience." ABC-Clio. 2002. (Feb. 16, 2015) https://books.google.com/books?id=Gr4snwg7iaEC&pg=PA407&dq=chariots+of+the+gods+pyramids&hl=en&sa=X&ei=FQfhVMPpJsymgwSCtoK4BQ&ved=0CCsQ6AEwAQ#v=onepage&q=chariots%20of%20the%20gods%20pyramids&f=false
  • Starr, Michelle. "Mystery solved: The sailing stones of Death Valley." CNet. Aug. 27, 2014. (Feb. 13, 2015) http://www.cnet.com/news/mystery-solved-the-sailing-stones-of-death-valley/
  • Stromberg, Joseph. "Why Did the Mayan Civilization Collapse? A New Study Points to Deforestation and Climate Change." Smithsonian. Aug. 23, 2012. (Feb. 13, 2015) http://www.smithsonianmag.com/science-nature/why-did-the-mayan-civilization-collapse-a-new-study-points-to-deforestation-and-climate-change-30863026/?no-ist
  • United States Coast Guard. "Does The Bermuda Triangle Really Exist?" Uscg.mil. Nov. 17, 2014. (Feb. 14, 2015) http://www.uscg.mil/history/faqs/triangle.asp
  • Valsecchi, Maria Cristina. "Crater From 1908 Russian Space Impact Found, Team Says." National Geographic News. Nov. 7, 2007. (Feb. 14, 2015) http://news.nationalgeographic.com/news/2007/11/071107-russia-crater.html


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