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201) What percent of the Universe is visible?

All the stars, planets and galaxies that can be seen today make up just 4 percent of the universe. The other 96 percent is made of stuff astronomers can't see, detect or even comprehend. These mysterious substances are called dark energy and dark matter.

202) How often does your stomach manufacutre a new lining?

Your stomach manufactures a new lining every three days to avoid digesting itself.

203) The bark of which tree is fireproof?

Older redwoods are able to survive fires because their bark is so thick and acts as a fireproof shell.

204) What kind of sugar is found in DNA?

Deoxyribonucleic acid contains the 5-carbon deoxyribose sugar.

205) How many scents can the average person remember?

Your nose can remember 50,000 different scents.

206) Which of the following is least likely to kill bacteria?

Extreme cold, while inhibiting the growth of most bacteria, does not usually kill them. And although heat and high and low pH will kill most known species of bacteria, certain species of Archaea can live in these extreme environments.

207) Which of the following forms the largest biomass on Earth?

There are approximately 5x1030 bacteria on Earth, forming a biomass which exceeds that of all plants and animals.

208) What is the name of the closest large spiral galaxy to our own Milky Way?

Andromeda, also known as M31 and NGC224 is a spiral galaxy similar to our own but twice as large. It contains about 400 billion stars.

209) What is the most slippery substance in the world?

Polytetrafluoroethene, also known as Teflon, is often used as a non-stick coating for pans and other cookware. It's resistance to van der Waals forces means that it is the only known surface to which a gecko cannot stick.

210) How long would you have to yell to produce enough sound energy to heat a cup of coffee?

If you yelled for 8 years, 7 months and 6 days, you would have produced just enough sound energy to heat up one cup of coffee.