Add Yahoo as a preferred source to see more of our stories on Google. Close-up shot of a set of knives hung on a wall - Thomas Barwick/Getty Images You might already have a dedicated knife set in your ...

Imagine leaving your shiny metal bicycle outside in the rain. As water pools on its surfaces, oxygen from the air lingers nearby, and together they begin to quietly attack the metal. The iron in the ...

In the auto industry it's called patina. Scientists call it the result of oxidation or other chemical processes. We generally know it as rust. But no matter its name, it can at times have spectacular ...

I'm not a big fan of "patina". The word I mean, not the faded and corroded look of an old car. It's somewhere between the name of a bad teen pop star and a rejected pharmaceutical brand. It's also ...

(The Conversation is an independent and nonprofit source of news, analysis and commentary from academic experts.) Curious Kids is a series for children of all ages. If you have a question you’d like ...