Following one of Earth’s five greatest mass extinctions, tiny marine organisms called graptoloids did not begin to rapidly develop new physical traits until about 2 million years after competing species became extinct.
Heavy Internet Users Could Be Targeted for Prevention or Early Detection of Substance Abuse
Mouse study is first to show an external cause for increasingly common cancer
COLLEGE PARK, Md. – Though cellphones are usually considered devices that connect people, they may make users less socially minded, finds a recent study from the University of Maryland's Robert H. Smith School of Business.