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...Type of Hell Back in the Australian desert, though, the horrid King's namesake isn't quite so terrifying - although it does have two heads. Oh, yeah. Two heads. Wired magazine's counted them: Thorny devils have a strange, knob-like appendage on the backs of their necks, which is sometimes called a false head. When threatened, the lizard can tuck its real head down between...

...types that separates nervous system from circulatory system that transports blood around the brain, mainly conformed by very small blood vessels called microvessels (fig 1). The BBB acts as a gatekeeper to regulate what molecules and compounds travel from the blood into the brain tissue. Therefore, the BBB is highly selective and restricts the passage of molecules by...