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Knot research falls into a few categories: knot theory, a mathematical and theoretical look at knots; and a couple areas of research focused more on applications like DNA structures or surgical sutures in medicine Richard Drury/Getty Images hide caption

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Richard Drury/Getty Images

All Tied Up: The Study of Knots

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An employee of Sotheby's Dubai presents a 555.55 Carat Black Diamond called "The Enigma" on Monday that will be auctioned at Sotheby's Dubai gallery, in Dubai, United Arab Emirates. Kamran Jebreili/AP hide caption

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Kamran Jebreili/AP