Category: Aquatic

Octopus Limbs

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How do octopuses keep track of their 8 limbs? Researchers have discovered that secret behind an octopus’s dexterity comes from the radial symmetry of its legs. Check it out! | News from Science

Q&A Penguins

Penguins Baby Hi

I’ve just been reading a fantastic book about penguins. Smithsonian Q&A Penguins by Lloyd Spencer Davis has everything I’ve been wondering about. It’s written in accessible language. It’s also fun to read. I’ve read a lot about marine mammals, and I was wishing there was a similar volume that included penguins. The best I could […]

Crittercam

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National Geographic has a terrific device known as the Crittercam. The penguin on the left is wearing one. He’s not the only animal that has. It’s been worn by a variety of animals, including humpback whales and a bear cub. The idea for the Crittercam came to marine biologist and filmmaker Greg Marshall in 1986. […]

Jellyfish Power!

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This is the first post in a series on jellyfish. It explores the way jellyfish move through deep water. Sometimes it appears that jellyfish simply float and move with the water in the waves. Other times it seems that the wind blowing across the surface of the water is pushing the jellyfish along the surface.

Buoyancy: Swim Bladders

Aquatic

We’ve all heard that a shark must swim continuously or sink. Do you know why? It’s because sharks do not have a¬†swim bladder. “This gas-filled sac provides buoyancy and helps to keep the fish afloat by keeping it in a neutrally buoyant state.” When in this state, the fish is neither rising nor sinking in […]

An Ocean of Air

Basics

In 1644, Evangelista Toricelli wrote, “We live submerged at the bottom of an ocean of air.” We don’t fee the force of the pressure of this fluid any more than aquatic creatures feel the force of the water on all sides. Why? Because there is a uniformity of pressure in both cases; gravity exerts pressure on all sides.

James Cameron at Ocean’s Deepest Point

Big News

Not only has James Cameron reached the deepest point in the Mariana Trench, he’s tweeted to let us all know! That’s an amazing use of technology given that he is about 7,000 feet deeper than Mt. Everest is tall! To say conditions down there are inhospitable to human life is to put it mildly. The […]