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221) What acid gives lemons, limes, oranges, and grapfruit their distinctive taste?

Lemons and limes have particularly high concentrations of citric acid.

222) How big was the largest earthquake on record?

The largest recorded earthquake in the world was a magnitude 9.5 quake in Chile on May 22, 1960.

223) Which chemical element is named after the creator of dynamite?

Nobelium, a synthetic chemical element with symbol No and atomic number 102, is named in honor of Alfred Nobel, the inventor of dynamite who bequeathed his fortune to institute the Nobel Prizes.

224) What kind of scientist was Linus Pauling?

For his scientific work, Pauling was awarded the Nobel Prize in Chemistry in 1954.

225) What was Michael Faraday's primary discovery?

Although Michael Faraday received little formal education, he was one of the most influential scientists in history. His main discoveries include the principles underlying electromagnetic induction, diamagnetism and electrolysis.

226) What kind of scientist was George Washington Carver?

George Washington Carver was an American botanist and inventor. His reputation is largely based on his promotion of alternative crops to cotton, such as peanuts and sweet potatoes.

227) What did Marie Curie name the first chemical element she discovered?

She named the first chemical element that she discovered polonium after her native country--Poland.

228) A light year is a unit of ______.

A light year is the distance light travels in one year -- about 5.88 trillion miles (9.5 trillion km).

229) Which of the following are thallophytes?

Thallophytes (like algae) are plants that have no stem, roots or leaves.

230) The center of mass of which of the following objects will not lie inside the object itself?

Concave or hollow objects have centers of mass inside their "shells", so the center of mass of a Frisbee will not lie inside the object, but rather outside towards the curved surface.