US maternal deaths doubled in last 20 years, study finds

Nathan Law: Hong Kong activist in UK fears for safety over bounty

Federal complaint challenges Harvard legacy admissions

Fourth of July: Air travel chaos resumes ahead of Independence Day

Baltimore shooting: Police hunt for suspects after dozens shot at block party

Moving vans become a last resort in summer travel chaos

Canada Day fireworks cancelled over air quality fears

Scorching heat fuels calls for worker protections

How bad is repeat exposure to wildfire smoke?

5G deadline and bad weather threaten to disrupt US holiday weekend

Smoke and heat warnings affect more than 170m in US

Chinese spy balloon did not collect information, says Pentagon