Rare-earth elements are a set of metallic elements in the periodic table. Chemists usually refer to a group of 17 elements when they use this label: the 15 lanthanides from lanthanum to lutetium, and ...

As private schools proliferate, states are taking a hands-off approach to regulating them. School founders — in one case, a woman prosecuted for sexual abuse — often aren’t screened. Some states can’t ...