It’s time for another ‘Ask the Expert’ question from our readers. This reader wants to know how we really know the universe is expanding – Paul Heckert, PhD has the answer.
Methane is a greenhouse gas more powerful than carbon dioxide. Here we describe the main methane sources and the possible measures to decrease its emissions
Radar doesn’t always accurately show precipitation. Sometimes you see what isn’t there — and sometimes you don’t see what’s there.
Returning nightmares can make you miserable. Stopping the scary dreams could be as simple as changing your medication, or using a visualization technique.
Sucralose is a common artificial sweetener, but according to the research, it may not be very safe to use – either for human health or for the environment.
Erythritol is a low calorie sugar substitute derived from natural sources. Is this sweetener dangerous when manufactured commercially, or safe to consume?
Answering a reader’s question, Mike DeHaan breaks down the statistics of school shootings and plane crashes to see which is more likely.
Why are some flames are orange and others blue? You might be surprised at the physics and the chemistry behind the colors of flame.
What are the practical use of matrices in day to day life? From computer-generated images to electrical circuits, matrix math serves us well.