Gas bubbles effervesce from a mound of muck on the seafloor in a deep submarine canyon off the west coast of Canada. Microbes beneath the sediment belch the bubbles after feasting on the ancient remains of algae, sea critters and their poop: a primordial stew that’s been simmering since long before humans walked the Earth.
This gassy oasis attracts an odd collection of critters. Worms...
Food for Thought
Last May, tissues from the carcass of a North American cow turned up positive for bovine spongiform encephalopathy–the ailment responsible for mad cow disease. Within hours, the Canadian government traced the animal to the Alberta farm where it had been raised for its 8 years of life. In short order, other members of its herd were quarantined.
What made this...
More than 1,800 years ago, the Greek physician Galen came up with a model for how the human body works. Blood, which he called the "natural spirit," originated in the liver and traveled to all parts of the body through the veins. In the left side of the heart, some of the blood mixed with air from the lungs to make "vital spirit," which flowed to all parts of the body through the arteries....