The peak of La Danta—one of the world's largest pyramids—pokes through the forest canopy. "All this was abandoned nearly 2,000 years ago," says archaeologist Richard Hansen. "It's like finding Pompeii ...
A complex and multilayered immune defence system protects the host against harmful agents and maintains tissue homeostasis. Cigarette smoke ex posure markedly impacts the immune system, compromising ...
We identified many of the cancer-causing chemicals in cigarette smoke and coal tar – including the first pure carcinogen ever to be isolated We now know that exposure to certain chemicals, such as ...
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