Do You Know
Questions & Answers on General Knowledge.
Why isn't the sky bright blue when the sun is red?
During the day, the sky is blue because the air and dust in the air scatter mainly blue light toward your eyes. They also scatter some red light, but the blue light dominates. But at sunset, things change. The setting sun approaches the earth's atmosphere at a very shallow angle so that it must travel many kilometers through the air before reaching your eyes. During this long trip, most of the blue light is scattered away and the sun appears very red. If the path is long enough, the blue light is scattered away many kilometers to your west so that there isn't much of it left. When this occurs, even the sky around you appears somewhat reddish because there just isn't any more blue to scatter. The missing blue light is visible to people living 50 or 100 kilometers to the west as their blue sky.
What is an avalanche?
Did the Renaissance affect art?
How big is a hectare?
Do hippopotamuses sweat blood?
How much of Earth is covered with land and water?
Why is an informer called a “stool pigeon”?
Why are newborn emerald tree boas red or orange in colour, while the adults are green?
Why when someone takes credit for another person’s achievement do we say she “stole his thunder”?
What causes day and night?
What makes gas giants unique?
Is a CB radio also an AM radio?
Why does a comet have a tail?
Why are batteries so expensive?
What makes the clouds white - or having colors at sunset and why is the sky gray on a cloudy day?
What’s a cobweb?
How do the different jet engines work on aircraft the turbojet, the turbofan, and the turboprop?
What is heaven?
Why do some trees shed their leaves?
What does my brain do, besides think?
What is the purpose of the iron core in a transformer?
How does a Tesla coil work?
What is brachiation?
Is it the tower or the clock on the British Houses of Parliament that is called Big Ben?
My third grade art class was wondering what color things would be if there was no sunlight?
Why do tortoises have a shell?
Total Body Water
Standard English Grammar Test
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