Why Do Stars Twinkle?
What distorts the light coming from a star is temperature variations in the air. As you probably know already, air temperature varies a great…
TellMeWhy
A wonderful and marvelous collection of answers to intriguing questions everyone ask about the world covering almost every subject, from science and history to art, language, mathematics, technology, and homeschooling
How Can a Helicopter Go Straight Up?
A Helicopter can go straight up or down and hover in the air without moving. Helicopters can also fly backwards and sideways. They can even…
Why Can You Sometimes See the Moon During Daytime?
Sometimes we can see the moon during daytime. Some people think that the moon can be seen only at night, but this isn’t true.…
What Is Pencil Lead Made of?
The common name “pencil lead” is due to an historic association with the stylus made of lead in ancient Roman times. The ancient Romans…
Does Everyone Have a Blind Spot?
Yes, everyone has a blind spot and it is a small area in the back of the eye where there are no rods or…