Starfish belong to the same group of invertebrates that live in the sea.  These animals are echinoderms , which means …

Have you ever seen a jellyfish? It looks like an umbrella with projections, called tentacles, hanging down from the…

12 October 1492 – Christopher Columbus discovers America - painting by John Vanderlyn. When we say "discovered…

Since the Russian Tsar Alexander II was not particularly interested in Alaska, the Minister of Foreign Affairs at the t…

Over the years, gigantic storms that originate in the tropics have killed more people around the world than any other s…

Do you live in a place where the water is "hard"?   It is easy to tell if you do, because a chalky layer, or…

Put two or three pinches of table salt into half a glass of water and stir the water with a spoon. What happens? The …

How can you tell a fresh egg from a rotten one?  It's easy. Put them in a bowl of water. The fresh egg will sink b…

Hot water or steam in pipes is a convenient way of moving heat around buildings. This is what some central heating syst…

Have you ever stood outside during a bad storm and seen a sudden flash light up the sky?  That was probably lightni…

On most nights of the year, the sky is lit up by our nearest neighbor in space, the moon. The Latin word for the moo…