The wispy ice clouds formed by jet exhaust help trap heat near the Earth’s surface. But small changes in altitude can dampen the effect, a study says.
A team of lawyers and psychologists reviewed 364 exams used in the legal system, finding a third of them don’t pass muster with forensic mental health experts.
Cosmologists want to know how fast the universe is growing, but their data doesn’t match predictions. Wendy Freedman thinks red giant stars can help.