Researchers say they have a lot more work to do.
Mars Desert Research Station in Utah
Heat waves appear across the tarmac at Sky Harbor International Airport.
Temperatures climb to near-record highs.
Columbia University graduation
Evidence suggests potassium may have an effect on hypertension.
Colorado would become the first state to have such a ban.
“Our species is much older than we thought.”
Trump has repeatedly condemned the investigation.
Members of the Republican Congressional softball team.