Prairie Potholes

Natural wetlands in the upper U.S. and Canada — known as prairie potholes. These natural depressions formed thousands of years ago by glaciers that scraped over that part of North America. The potholes themselves come in a variety of shapes and sizes. When viewed from above, they look like a mosiac of moon craters. Like … Continue reading Prairie Potholes

More Than Something in the Water

Personally, I’d prefer a future to a hamburger any day. Please email this to a meat-eater. In the last week of May 2000, a new strain of the E. coli bacteria contaminated the water supply of a small Ontario farming community. Six people died and up to a thousand people were crippled by cramps, severe … Continue reading More Than Something in the Water

Glacier Lake Floods

Glaciers in the mountains of India, Nepal, and Tibet are melting . . . Lakes sometimes form on top of the glaciers. When they grow too rapidly, they burst over natural rocky dams and surge down river valleys — with the potential to destroy villages below. Japanese scientists spotted this hazard in the Himalayas in … Continue reading Glacier Lake Floods

The Same Moon

We recently recorded this question. Melissa: Hi, my name is Melissa and I’m from Chicago, Illinois, and my question is: if I’m living in California and I’m talking to a friend in New York City, and we look at the moon at the same time, does it look the same to both of us? If … Continue reading The Same Moon

How is wind chill calculated?

Our bodies emit heat that normally stays in a thin envelope of warm air all around us. When the wind whisks away that warm layer, we lose heat faster — and that’s wind chill. The formula calculates the relationship between wind speed, air temperature and how cold you feel. The wind chill concept came from … Continue reading How is wind chill calculated?