Two mathematicians have proved that a straightforward question — how hard is it to untie a knot? — has a complicated answer.

Learn how to enable the Scientific Calculator and use Math Notes on your iPhone, and breeze through Math equations with ease.

Influential conservative activist Charlie Kirk was assassinated on Wednesday during a campus speaking event in Utah. He was 31. Kirk, the co-founder of Turning Point USA and a married father of two, ...

Glentoran remain two points ahead of Cliftonville at the top of the Women's Premiership after both sides won their respective matches on Friday night. The Glens won 2-1 at Lisburn Rangers, with Jess ...

Marcia Kramer joined CBS News New York in 1990 as an investigative and political reporter. Prior to CBS2, she was the City Hall bureau chief at the New York Daily News. According to the poll by ...

Nvidia Corp. NVDA is up 2% in midday trading Monday, moving within striking distance of its all-time high—now less than 2 percentage points away—as investors remain upbeat ahead of the company's ...

The Atlanta Hawks are hoping to become contenders this season, and with the offseason acquisitions of Kristaps Porzingis, Nickeil Alexander-Walker, and Luke Kennard, they are closer to the top of the ...

The RSPCA has made an appeal to find loving homes for seven lurcher dogs who have vegetable-themed names. The siblings, who are around two years old, have spent most of their lives being cared for by ...

Ugly scenes unfolded at The Gabba on Saturday night as a brawl broke out between multiple fans, leaving one individual with a bloodied nose. Queensland Police are investigating the incident which took ...

The brilliance of corner-forwards Michael Gargan and Cian Shekleton saw Kingscourt earn a precious opening Cavan SFC win against Cavan Gaels tonight. The pair combined for 0-10 from play, with ...

Jen Easterly, who had served in Republican and Democratic administrations, was headed to the academy. Then a right-wing activist stepped in. By Greg Jaffe Reporting from Washington Hours after West ...