Do You Know
Questions & Answers on General Knowledge.
How did the first reptiles evolve on Earth?
About 300 million years ago, amphibians evolved into reptiles. These reptiles continued to adapt to their environment. They developed a better way of breathing than amphibians – amphibians breathe by moving their throat muscles, but the dinosaurs moved the muscles below the rib cage and abdomen, just like us. As a result, they could take in more air.
Why do planes disappear in the Bermuda Triangle?
Why do objects on earth accelerate downward at the same speed regardless of their mass?
What did the Chinese take to Japan?
What is a cord used to measure?
Where is the longest bridge?
What are sunspots?
What are earthquake zones?
Why and how does water conduct electricity?
If only electrons move around, why do you keep using positive charges in the demos?
In alternating current, current reverses directions rapidly between the two wires, white and black. Why is it that only the black wire is "hot"?
Who was Mona Lisa in da Vinci’s famous masterpiece?
How do rockets work?
I didn't understand how a car (or wagon) starts its motion.
Is water, at say 35° F, more dense than water at 80° F?
Why is it that the times at which the moon sets and rises change so much from day to day?
How does an astronaut get prepared for the long period of antigravity that he is going to be put on?
What properties of rubber change in order to make one ball bounce better than another?
Is the rattlesnake poisonous?
Where is the driest place in the world?
How do you push a shopping cart and have the cart exert the same force on you, if you are still traveling forward? Friction? Air Resistance?
What is a citizen?
Why are days longer in summer and shorter in winter?
Do volcanoes erupt regularly?
Why do some parts of a house get dustier than others?
How did the Civil War end?
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