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

Get live updates and the latest news as the Senate passes a bill to reopen the government and Trump criticizes air traffic ...

By Alexandra Banner, CNN Happy Veterans Day, readers. Ceremonies and tributes will be held across the country today to honor the millions of men and women ...

The Senate, with the help of Democratic defectors, passed a bill to end the longest government shutdown without the health ...

The food that shaped Shakespeare’s plays – and how to cook it today - From banquets fit for kings to tavern feasts and lovers ...

If you dread the thought of cutting onions, take a little advice from celebrity chef Rachael Ray. Who knows, you might just ...

Find out how hotels are reducing food waste effectively with innovative tools and strategies to meet climate goals.

While the government shutdown may soon be in the rearview mirror, it could leave air travel in a chokehold for months, and ...

Ezra Klein and Aaron Retica discuss whether affordability is the Democrats’ winning message, Trump’s politics of cruelty and ...

Shower valves with two handles aren’t strictly illegal. They are, however, prohibited in new construction and remodeling in ...

About 50% of the tiger cubs will not survive up to one year, even if they are with their mother. Mothers push cubs to become ...