Time travel is deterministic and locally free, a paper says—resolving an age-old paradox. This follows research observing that the present is not changed by a time-traveling qubit. It’s still not very ...

In the late 1980s, one of us (SNB) published a study that demonstrated that individuals with a low (below first quintile=20th percentile) cardiorespiratory fitness level had a higher risk of mortality ...

Black Friday online sales hit $11.8 billion, up 9.1% from last year, Adobe Analytics says AI tools help consumers find deals, boosting online shopping Physical store traffic subdued due to inflation, ...

Investopedia contributors come from a range of backgrounds, and over 25 years there have been thousands of expert writers and editors who have contributed. Michael Boyle is an experienced financial ...

December 14, 2025 • What was the biggest thing that changed for you this year? We’ll go first: our host Ayesha Rascoe bought a house with her best friend! Now the two of them are living together and ...

This quiz dives into the historic and scientific journey behind the search for life in the universe—testing your knowledge of the thinkers, missions, and discoveries that shaped our cosmic curiosity.

December 18, 2025 • During a nationwide address, President Trump says the U.S. is poised for an economic boom. And, some Republican lawmakers joined Democrats to force a vote on enhanced healthcare ...