"Everyone in the U.S. is consuming salt far in excess of what is good for them," says lead author Dr. Kirsten Bibbins-Domingo of UCSF.

The ability to sleep in one chunk (整塊時(shí)間) overnight goes down as we age but the amount of sleep we need to function well does not change," Dr Drummond told the American Association for the Advancement of Science conference in San Diego.

Dr William Bird, researcher from the Royal Society for the Protection of Birds, states in his study, "A natural environment can reduce violent behaviour because its restorative process helps reduce anger and impulsive behaviour.