About 10 percent of Americans aged 71 and up, or 2.4 million people, have Alzheimer's disease and 1 million more have some other form of dementia, researchers said on Tuesday, offering figures lower than some widely cited estimates.
US astronomers have discovered the biggest black hole orbiting a star 1.8 million light-years from Earth in the constellation Cassiopeia, with a record-setting mass of 24 to 33 times that of our Sun, NASA said Tuesday.
A potent clot-busting substance originally extracted from the saliva of vampire bats may be used up to three times longer than the current stroke treatment window - without increasing the risk for additional brain damage.
U.S. researchers have manipulated neurons in mice to light up in a rainbow of fluorescent hues, creating a powerful tool for mapping out the brain's complicated wiring plan, they said on Wednesday.
