By the time they are teens, students who have had academic difficulties and a deficit of trusting relationships have perfected a variety of strategies to hide their weaknesses and avoid being abandoned again. (educationnext.org)
They have perfected a variety of clever, ultrasensitive torsion balance experiments and have spent more than 25 years looking for any twisting that would indicate the presence of new forces operating over long distances. (discovermagazine.com)