Why did frost form when temperatures were above freezing?

Authorities say a Texas man fatally shot his twin 12-year-old daughters before killing himself last week after threatening violence against his family.

Foreign visitors at the Beijing Olympics are strictly segregated from the public under China’s zero-tolerance virus containment strategy.

Prime Minister Boris Johnson has renewed Britain’s threat to break from part of the Brexit divorce deal it signed with the European Union unless differences over Northern Ireland trade are resolved.

Scientists say damaging frost that caused significant economic loss to France’s central winegrowing region this year was made more likely by climate change.