Psychological tests were given to 9,000 boys and girls aged 9 or 10 in the USA.
The researchers are calling for an international treaty to help reduce the production of new plastics.
Underlying factors like hormone imbalances could be fueling the tumors.
New treatments for the non-motor symptoms of Parkinson's disease and PSP could be around the corner.
With robots, surgeons can guide "minimally invasive instruments" remotely using a console and 3D view.
In total 6.8 percent of pregnant women succeeded in quitting thanks to electronic cigarettes compared to 4.4 percent with patches.
Below the surface, they could be reinforcing the beach's defenses.
"Coffee is the most frequently consumed central stimulant worldwide."
It is a first step towards producing food and oxygen on the moon - or during space missions.
Those who attended Taekwondo classes performed better and received higher ratings from teachers.