For more than two years, Ukrainian serviceman Nazar Daletskiy was believed to be dead. After DNA testing, his mother "buried" her son. But on February 5, he returned from Russian captivity during the ...

Ukraine and Russia conducted a long-awaited prisoner-of-warexchange on Feb. 5, the first in several months after rumors about the corresponding negotiations had circulated since December 2025. The ...

Five years ago, mathematicians Dawei Chen and Quentin Gendron were trying to untangle a difficult area of algebraic geometry involving differentials, elements of calculus used to measure distance ...