Are Days and Nights Getting Longer?
Are Days and Nights Getting Longer? The summer solstice that falls this year on June 21 marks the longest day of the year in the Northern He
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Gravity
How Does a Siphon Work?
How Does a Siphon Work? A siphon is a self-powered pump. Fill a rubber tube with water and pinch the ends to keep the water in. Put one end
Why Do Stars Shine Only at Night?
Why Do Stars Shine Only at Night? Though stars seem to disappear when daylight comes, there are really stars in the sky all day, and their l
What Is Gravity?
When you toss a ball into the air, it comes down because it is pulled to earth by gravity. Gravity is a force that pulls all things on the e
What Are Scales and How Do They Work?
What Are Scales and How Do They Work? Scales are valuable tools that help us keep track of our weight. In addition to doctors’ offices, you’