I'm excited to announce a special guest to help answer the question of whether anti-pollution masks are effective at filtering unhealthy air. My guest is completely neutral, and has been the lead researcher

I design calculators. Here's one I'm most proud of: Just kidding. I do love the icon, but I'm talking about a different kind of calculator. I design calculator apps that take simple inputs, run them through

Why do cops and security guards wear bulletproof vests, but leave their heads exposed? This is a common question, made famous by the classic American comedy Dumb & Dumber A commonly-cited answer is

How much time do you have to react in an active shooter scenario? I surveyed several top active shooter training organizations on timing. The number one answer? It depends. Here's what Apex Defense Group,