| Date | Topic |
|---|
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| 2008-05-18 | Mammals are the only animals with flaps around the ears. |
| 2008-04-06 | During a total solar eclipse the temperature can drop by 6 degrees Celsius (about 20 degrees Fahrenheit). |
| 2007-09-09 | Just one part oil per million parts water will make drinking water smell and taste funny. One gallon of petrol can contaminate 750,000 gallons of water. |
| 2007-06-15 | Among all shapes with the same perimeter a circle has the largest area.
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| 2007-06-07 | Human jaw muscles can generate a force of 200 pounds (90.8 kilograms) on the molars. |
| 2007-05-28 | Fishes cannot live in the Dead Sea because the water has too much salt in it? |
| 2007-05-15 | Hydrogen is an explosive gas. Oxygen supports combustion. Yet when these are combined it is water which is used to put out fires. |
| 2007-05-11 | Race car is a palindrome. |
| 2007-05-06 | "Mobile" or "Cell"
What is correct: "mobile" phone or "cell" phone? Same thing. The word cell is short for cellular and has been used since Bell Laboratories set up the first wireless telephony system in 1947. It consisted of a network of low-powered transmitters, each placed to cover a small region or cell. Commercial cell phones were introduced in Chicago in 1978 and in Europe in 1981. If you're surprised to learn that mobile telephony has been around so long, here's another surprise: Bell Laboratories invented the videophone in 1927. |
| 2007-04-25 | The Swiss flag is square.
Flag description:
red square with a bold, equilateral white cross in the center that does not extend to the edges of the flag |
| 2007-02-23 | Hydrogen gas is the least dense substance in the world, at 0.08988 g/cc.
additionally
Hydrogen solid is the most dense substance in the world, at 70.6 g/cc |
