ScienceIQ.com

Food Irradiation: A Safe Measure

Food safety is a subject of growing importance to consumers. One reason is the emergence of new types of harmful bacteria or evolving forms of older ones that can cause serious illness. A relatively new strain of E. coli, for example, has caused severe, and in some cases life-threatening, outbreaks of food-borne illness through contaminated ...

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FoodIrradiationASafeMeasure
Engineering

For Want Of An O-Ring

Who can forget the Challenger disaster of 1986, the culprit, a failed O-ring. But what exactly is an O-ring and how did it cause the destruction of this space shuttle? When surfaces are flat, gaskets ... Continue reading

ForWantOfAnORing
Medicine

What Is Sickle Cell Anemia?

Sickle cell anemia is an inherited blood disease. That means you are born with it and it lasts a lifetime. Sickle cell anemia affects the red blood cells. Normal red blood cells are smooth and round ... Continue reading

WhatIsSickleCellAnemia
Biology

How Blood Clots

Scabby knees and bruised shins are as much a part of growing up as climbing trees. Minor injuries from paper cuts to skinned elbows are nothing to worry about for most people, because the blood's ... Continue reading

BloodClots
Biology

Did You Smell Something?

There's not a moment of our lives when smells -- or, more precisely, odor molecules -- aren't impacting our brain. It's been estimated that it takes at least 40 molecules of a given odor for us to be ... Continue reading

Smell

I Am The Walrus

IAmTheWalrusThe walrus is a member of the pinniped family, which also includes sea lions and seals. Walrus differ from some seals in that they can turn their hind limbs forward. This characteristic enables them to raise themselves up, giving them greater freedom of movement on land. Two subspecies, the Atlantic and Pacific walrus, live in the arctic and subarctic regions of the Northern Hemisphere. The Pacific walrus is the largest. The walrus is covered by a thick layer of fat and a tough leathery skin with a thin layer of hair which is light brown on adults and almost black on young walrus. The walrus' head is small in comparison with its heavy, clumsy body, and the upper lip is thick and fleshy with a stiff moustache made up of bristles which are important sensory organs. Although there are other teeth in the upper jaw, it is the greatly enlarged canine teeth, called tusks, that give the walrus its distinctive appearance.

Walrus primarily eat species that dwell on the sea bottom, such as mollusks; salt worms; crabs, shrimp, and other crustaceans; and octopus. The walrus drags its tusks like sled runners along the sea bottom, rooting out buried prey with its snout and stiff facial bristles. Occasionally walrus may consume other pinnipeds such as spotted, ringed, and bearded seals. Tusks also serve as an indicator of social rank and may be used as protection. Sometimes, when a walrus wants to rest while still in the water, it will hook its tusks over the edge of an ice floe. Tusks may also be used to break up an ice floe to keep breathing holes open or to retrieve calves that have become stuck in the ice.

Walrus spend most of their lives at sea, although they frequently come out of the water, or haul out, onto ice floes or land to rest. They also leave the water to give birth to their young and to shed their hair. Keeping mainly to the moving ice packs, walrus migrate north in spring and south in winter. For thousands of years, the walrus was regarded by Eskimos and other Native people of the North as having supernatural powers and human attributes. It was also a natural resource of major importance to their culture. They obtained food and fuel from the walrus, as well as raw materials for making tools, shelter, boats, sleds, and clothing. The walrus was hunted for centuries by Russians, Americans, and others for its valuable ivory tusks and oil. In the United States, the walrus became a federally protected species with the passage of the 1972 Marine Mammal Protection Act.