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 New Study Challenges the Reliability of Court Psych Exams
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.
Science Has a New Way to Gauge the Universe’s Expansion Rate
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.