The Adventures of a Girl and her Pet Shark

(Source: sharks-ahoy, via sharks-ahoy)

(Source: sharks-ahoy, via sharks-ahoy)

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rhamphotheca: How Sharks Go Fast by Elizabeth Pennisi Researchers have discovered what makes the shark almost impossible to outswim. By using an engineering imaging technique, researchers have discovered that as a shark’s tail swings from side to side, it creates twice as many jets of water as other fishes’ tails, smoothing out the thrust and likely making swimming more efficient. Sharks do this by stiffening the tail midswing, a strategy that might one day be applied to underwater vehicles to improve their performance. “The authors have made a persuasive argument that muscles in the fin are modifying the shape and possibly the texture of the fin to modify the [water] flow” throughout the stroke cycle, says Frank Fish, a biomechanist at West Chester University in Pennsylvania. For fish to move forward, they have to push water backward. And sharks have an added burden: they sink when they stop swimming, so they must be in constant motion. To help generate lift to keep midwater, the top of the tail extends farther back than the bottom, creating a slant along the back edge. Most other fish have tails that are essentially symmetrical from top to bottom… (read more: Science NOW)     (image: Brooke E. Flammang)

rhamphotheca:

How Sharks Go Fast

by Elizabeth Pennisi

Researchers have discovered what makes the shark almost impossible to outswim. By using an engineering imaging technique, researchers have discovered that as a shark’s tail swings from side to side, it creates twice as many jets of water as other fishes’ tails, smoothing out the thrust and likely making swimming more efficient. Sharks do this by stiffening the tail midswing, a strategy that might one day be applied to underwater vehicles to improve their performance.

“The authors have made a persuasive argument that muscles in the fin are modifying the shape and possibly the texture of the fin to modify the [water] flow” throughout the stroke cycle, says Frank Fish, a biomechanist at West Chester University in Pennsylvania.

For fish to move forward, they have to push water backward. And sharks have an added burden: they sink when they stop swimming, so they must be in constant motion. To help generate lift to keep midwater, the top of the tail extends farther back than the bottom, creating a slant along the back edge. Most other fish have tails that are essentially symmetrical from top to bottom…

(read more: Science NOW)     (image: Brooke E. Flammang)

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shaaarks: Costa Rican Money

shaaarks:

Costa Rican Money

sharks-ahoy:

This is such a good idea, to hand out to a bunch of people! Ah I’m gonna make a million and throw them around my school

…. problem is I’d get in trouble because everyone would know it was me, the shark-lover, who vandalized my school -.-

Gonna do thissss

(Source: frenearden)

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