Tropical Weight Loss
Tropical Weight Loss
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New research from the University of South Florida suggests that one of the evolutionary secrets of the shark's success hides in one of its tiniest traits -- flexible scales on the bodies of these peerless predators that make them better hunters by allowing them to change directions while moving at full speed.
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Read More »New research from the University of South Florida suggests that one of the evolutionary secrets of the shark's success hides in one of its tiniest traits -- flexible scales on the bodies of these peerless predators that make them better hunters by allowing them to change directions while moving at full speed. The key to this ability lies in the fact that the scales control water flow separation across the creatures' bodies, says Amy Lang of the University of Alabama who will present work she performed with her colleagues at the University of South Florida Nov. 23 at the American Physical Society's Division of Fluid Dynamics (DFD) annual meeting in Long Beach, CA. Flow separation is an issue in systems like aircraft design, explains Lang, because it tends to cause vortices that impede speed and stability. "In nature, if you look at surfaces of animals, you'll see that they are not smooth," she says. "They have patterns. Why? One common application of patterning a surface is to control flow -- think of the dimples of a golf ball that help the ball fly farther. We believe scales on fast-swimming sharks serve a similar purpose of flow separation control." Based on experimental measurements and models of shark scales, Dr. Lang's team discovered that the bases of shortfin mako scales (literally small teeth covering their body) where they attach to the skin are not as wide as the tops of the scales. This tapered shape enables the scales to be easily manipulated to angles of 60 degrees or more, endowing them with movement called "denticle bristling." Also, these flexible scales are only found on parts of the body where flow separation is most likely to occur, such as behind the gills on the side of the body. Denticle bristling is the probable mechanism leading to flow separation control for the shortfin mako shark. "As we investigate further, we imagine applications of controlling flow separation in design of aircraft, helicopters, wind turbines -- anywhere flow separation is an issue," Lang adds.
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Read More »Kevin O'Leary: Worst 'Shark Tank' investment ever lost half a million.
If there's one thing Kevin O'Leary has learned from more than three decades as an investor, it's that not every bet pays off. On ABC's "Shark Tank," O'Leary has invested more than $8.5 million in roughly 40 companies since the show debuted in 2009, according to an estimate from Sharkalytics. The longtime investor and chairman of O'Shares ETFs has some notable successes, like an investment in online meal kit service Plated that later sold for $300 million. He's also seen his fair share of disappointing deals. "What I've learned after doing this a long time [is] no matter how you feel, and how optimistic you are, in the moment of making an investment, pulling the trigger, you have no idea of the outcome," O'Leary tells CNBC Make It. "You have zero probability."
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