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There are approximately 2,500 mosquito species in the world, but a mere fraction of them feed on human blood. Of this fraction, only the females are vampires, as they require blood to nourish their eggs. When she's ready to lay these eggs, which usually number in the hundreds, the female typically does so on a small, still body of water. In some mosquito species, she creates little rafts for the eggs. They float until they hatch as tiny larvae a few days later. Like butterflies, they eventually turn into pupae, which ultimately metamorphose into the insects we know.

To truly abandon its nuclear program, Pyongyang must meet four international requirements--at present, an unlikely scenario.

Even for those who lived through the first atomic bombings, it will always be August 1945.

It's irrational to think that human beings would behave rationally in the hours and days after a nuclear terrorist attack.

Ever since Edward Jenner first scratched cowpox pus into the arm of an eight-year-old boy in an attempt to render him immune to smallpox in May 1796, there has been debate and controversy over the procedure. Vaccination, which Jenner derived from the Latin word "vaca" meaning "cow," was preceded by the practice of "variolation" in which dried pus from an individual recovering from smallpox was scratched into the arm of someone naïve to the disease--usually a child. "Variolus" means "pus-like material."