Science & Technology

A large portion of Greenland was an ice-free tundra landscape — perhaps covered by trees and roaming woolly mammoths — in the recent geologic past (about 416,000 years ago), a new study shows. The results help overturn a previous view that much of th…

Around one third of people with heart disease suffer from sleep problems. A team now shows that heart diseases affect the production of the sleep hormone melatonin in the pineal gland. The link between the two organs is a ganglion in the neck region. T…