Einstein’s claim that the speed of light is constant has survived more than a century of scrutiny—but scientists are still ...

Try as they might, scientists can’t truly rid a space or an object of its energy. But what “zero-point energy” really means ...

If I were to flip you the bird left-handed, which I sometimes do to mix things up, you’d notice that my middle finger is crooked, with a bulged knuckle. Why does it look like that? Catfish noodling.

Index funds track market indexes, automating investments and saving on fees. Vanguard offers low-cost index funds that cover various sectors and global stocks. Investors can start with ETFs or mutual ...