Knowledge Worth Knowing
Leave a steel tool outside in the rain and, given enough time, its shiny surface may begin turning reddish-brown. An old bicycle chain develops rough orange patches. A neglected garden … Continue Reading →
Every autumn, something remarkable happens to millions of trees. Leaves that have been green throughout spring and summer begin turning yellow, orange, red, purple and brown. Entire forests can change … Continue Reading →
Most of us associate the Moon with nighttime. The Sun appears during the day, the Moon comes out at night — at least, that’s how it can seem. But look … Continue Reading →
Have you ever listened to a recording of yourself and thought: “Do I really sound like that?” Your voice on a recording can seem higher, thinner or simply unfamiliar compared … Continue Reading →
You’re chopping an onion for dinner when your eyes suddenly start burning. A few seconds later, tears begin running down your face. Nothing emotional has happened. Your eyes are simply … Continue Reading →
A flash suddenly lights up the sky. Then, several seconds later: BOOM. Lightning and thunder are produced by the same event, yet they often seem separated by a noticeable delay. … Continue Reading →
Fog can transform a familiar landscape in minutes. Roads disappear into a grey haze, distant buildings become difficult to see, and tiny droplets of water seem to hang in the … Continue Reading →
Drop an ice cube into a glass of water and it floats. That seems completely ordinary because we’ve seen it countless times. But scientifically, water is doing something rather unusual. … Continue Reading →
Look up on a clear day and the sky appears blue. Around sunrise or sunset, however, that same sky can turn orange, red, pink or even purple. The Sun hasn’t … Continue Reading →