One thing you can say about the diminutive speckled sea louse: it's always on time.
Scientists studying the tiny crustacean, a marine cousin of the wood-louse, found that it runs not one, but two internal clocks. Not only does the creature have a circadian rhythm, or so called "body clock" like most land-dwelling animals, including humans, but it also has a circatidal clock that follows the 12.4-hour cycle of the tide.
Originally published on Thu September 26, 2013 2:01 pm
What would it take to persuade you to allow government researchers to squirt millions of live flu viruses up your nose?
A recently concluded project at the National Institutes of Health found, among other things, that $3,400 each was enough to attract plenty of volunteers.
"I am happy I could contribute in some way," says Kelli Beyer, 24, one of 46 healthy people who volunteered for the project. To get the money, the research subjects had to commit to several days of testing, then nine days in a hospital isolation ward once the virus was administered in a nasal spray.
A newly discovered fossil of a fish in China changes what scientists know about the origins of jaws. It turns out, human jaws are remarkably similar to the jaw of this 419-million-year-old fish. That suggests jaws evolved much earlier than previously thought.
As faces go, Entelognathus primordialisisn't much to look at, even for a fish.
But consider that the 419 million-year-old, armor-plated fish is the earliest known creature to have what humans might recognize as a face, according to research published Wednesday in Nature. That's mostly due to its bony, modern jaw.