Do You Know
Questions & Answers on General Knowledge.
What causes the colors in the aurora borealis?
These colors come from the atomic fluorescence of particles high above the earth's surface. As charged particles from the sun's "solar wind" spiral through the earth's magnetic field toward its poles, they collide with one another and with atoms in the earth's upper atmosphere. The energy of such collisions can excite the atoms involved and cause them to emit light.
What is the force produced when two cars crash?
Does the red color in fruit juice really come from a beetle?
I thought that glass could move, that is supposed to be a check for antique glass (It has flowed downward). Does glass move over hundreds of years?
What is a rift valley?
What is a supernova?
Do some plants eat insects?
Why do deserts have special plants and animals?
Please explain ideal mechanical advantage and actual mechanical advantage. How can I demonstrate these two ideas?
Are there any risks, other than a case of implosion, with regards to exposure to normal fluorescent lighting?
Can you give me an example of when the angular acceleration is in a different direction from the torque applied?
Why do mercury lamps without phosphors emit visible light at high pressure? What are the "forbidden" transitions?
What happens when a speaker blows?
What is the chemical formula for glass?
Which birds are raptors?
Why is an erratic person called a “screwball”?
Is it true that boas and pythons can go without food for several days?
How can U.S. money be used to measure items around the house?
What were ancient spices used for?
What is the difference between a bulb, a corm, and a tuber?
Why do the eyes of a big cat glow in the night?
Why is it said that something with proven quality has passed the “acid test”?
Why don’t dogs get hoarse when they bark a lot?
How do glasses work and what is the physics behind them?
Why does my voice sound different to me when I listen to a recording of myself?
How does the universe stay together?
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1928 Indian Altoona
US$247,500 The Altoona Speedway was a 1.25 mile (2 km) board track located in central Pennsylvania which was the home of the American Board Track Championship races during the 1920s. Winning Altoona was so important that a winning machine might adopt the track name as its own, as was the case with many other bikes and cars which won at other famous venues such Daytona, Bonneville, TT and IOM, Le Mans ad infinitum. On July 9, 1926, Curley Fredericks lapped Altoona at an average speed of 114 mph (183 km/h) in a race, the highest speed ever recorded on a circular track, and the Indian racer was immediately dubbed the Altoona.