2+ mon, 2+ week ago   (986+ words) On Earth and in space, this line marks the boundary between frozen and non-frozen A snow-capped mountain in the French Pyrenees shows that the snow cover gives way to bare ground at a specific elevation. This is an example of…...

6+ mon, 3+ week ago   (1809+ words) Most evolved slowly — some over centuries — which shows math to be a living language Modern math relies on a whole zoo of notations and symbols to stand in for words. But they didn’t exist for much of math’s history. Historians…...

5+ mon, 2+ week ago   (622+ words) The designs of flowers on Halafian pottery were made almost 8,000 years ago. Some show regular patterns in the number of petals. Floral designs on pottery made almost 8,000 years ago may be more than just art. They appear to be the…...

7+ mon, 1+ day ago   (1803+ words) Mirror-image forms of molecules, medicines and materials play important roles Your hands and feet mirror each other. They have chirality. This means one can’t exactly overlap the other. Most shoes and gloves only fit well onto one or the other…...

1+ week, 5+ day ago   (596+ words) Repeating patterns in shapes build everything from snowflakes to the body plans of life By folding a piece of paper in half and cutting a shape — such as a heart — from both sides at once, you can make a shape…...

4+ mon, 1+ week ago   (1803+ words) ‘Ghost references’ and other hallucinations also haunt research journals A citation includes information about a book, article or other source of information. Students often need to include citations in reports. But beware. Chatbots sometimes invent or garble citations, offering “sources…...