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191) Whose tomb did archaeologist Howard Carter discover in 1922?

Howard Carter became world-famous after discovering the intact tomb of the 18th Dynasty Pharaoh, Tutankhamun.

192) How big were the brains of the extinct species Australopithecus compared to a modern human brain?

The brains of most species of Australopithecus were roughly 35% of the size of a modern human brain.

193) Which of the following is NOT a gas at room temperature?

At room temperature lithium is a soft, silvery-white metal. It is the least dense of the solid elements and is the lightest of all the metals.

194) What did physicist Richard Feynman predict would be the highest atomic number possible on the periodic table?

Feynman once predicted that number 137 defines the table's outer limit. He believed that adding any more protons would produce an energy that could be quantified only by an imaginary number, rendering element 138 and higher impossible.

195) What is the only human organ that can regenerate itself?

The liver is the only organ that can regenerate itself thus making it possible for one person to donate part of their liver to another person. When a portion of the liver is transplanted, the donor's liver will regenerate back to its original size while the transplanted portion will grow to the appropriate size for the recipient

196) What does the "c" in E=mc2 stand for?

Einstein's famous equation shows that the increased relativistic mass (m) of a body comes from the energy of motion of the body--that is, its kinetic energy (E)--divided by the speed of light squared (c2).

197) What is the only human organ that can float in water?

Each of your lungs contains about 300 million balloon-like structures called alveoli, which replace the carbon-dioxide waste in your blood with oxygen.

198) What element can form up to 10 million different compounds?

Carbon is unique in that it is known to form up to 10 million different compounds.

199) How many bacterial cells are there in a gram of soil?

There are typically 40 million bacterial cells in a gram of soil.

200) Which organ cannot feel pain?

Although the brain is the tool we use to detect pain, there are no pain receptors in the brain itself -- so the brain cannot actually feel pain.