Showing results by narrator "Mark Schectman" in All Categories

When George M. Stratton made himself a pair of “inverting glasses," his world turned upside down – and the scientific community gained some interesting new perspective. Learn more on this episode of Now I Know. George M. Stratton was born in 1865 in Oakland, California. By his early thirties, he was a professor of philosophy at the University of California, Berkeley, but he took interest in psychology.

How does one keep a billion-dollar airport from cracking? Learn about San Francisco's groundbreaking solution to the seismic problem on this episode of Now I Know. The San Francisco Bay area is home to an extraordinary number of earthquakes. According to Earthquake Track, for a one-year period ending on March 24, 2016, the San Francisco Bay area experienced more than 650 earthquakes of magnitude 1.5 or greater – more than a dozen earthquakes a week.

Natural gas is odorless. And gas leaks are very dangerous. Is the solution a scratch-and-sniff sticker? Decide for yourself on this episode of Now I Know. Natural gas is odorless. As gas leaks are very dangerous – even the smallest spark can turn a peaceful, gas-filled room into a flaming inferno – gas companies give us a way to detect a leak. They add a colorless, flammable gas called mercaptan to the mix, which smells like rotten eggs or rotten cabbage.

It's common knowledge that rubbing alcohol makes cuts burn. But, why? Find out the answer to this burning question on this episode of Now I Know. Get a scrape or a cut and your first step – after the subtle facial expression you make from the pain – may be to grab some rubbing alcohol. Your goal is to clean off the wound before applying a bandage, as you want to shield the scrape from the elements, and prevent trapping bacteria or other stuff within the injured area.

Did you know that stop signs weren't always red? Explore the stop sign's colorful past on this episode of Now I Know. Ask enough people to describe a stop sign and you will get some pretty common answers: it has the word STOP in white lettering (at least in the United States), it has eight sides, and – of course – it’s red. Everyone knows that.