explainers

What Are Sinkholes And How Do They Work?

What Are Sinkholes And How Do They Work?

A sinkhole opened up and swallowed a bus this week in China, killing several people. A few months ago, another sinkhole opened up below a bus in my hometown of Pittsburgh; in that case, though, everybody escaped safely. Besides buses, sinkholes can also swallow cars, pedestrians, and houses. Here’s the…

What Is A Stent?

What Is A Stent?

Stents are simple and useful devices for people who suffer from heart problems or heart-induced chest pain. Placing a stent is a fairly simple medical procedure — let’s take a look at what’s involved.