Filming yourself at the gym isn't just for obnoxious TikTokers. I discuss why you may want to, how to do it effectively, and what equipment will help you get a good shot.

Meanwhile, your entire existence (and the existence of any object) can be plotted on what’s called a world line, a curving ...

There's a video floating around TikTok that will make the app crash if one views it. Many are confused about how it works.