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31) What gas becomes a superfluid when cooled to absolute zero?

When most liquids are cooled, the particles settle into a regular order, and the liquid becomes a solid. But helium atoms are so light and weakly drawn to one another that even when ordinary atomic motions have quieted, the atoms jiggle with zero-point motion, a slight momentum imparted by the quantum uncertainty principle. Hence, they never settle into the solid state.

32) How often does Halley's Comet pass Earth?

Halley's comet was recorded by Edmund Halley in 1682. It was seen again in 1758, 1835, 1910, and 1986 -- approximately every 76 years.

33) What kind of scientist was Luther Burbank?

Burbank developed more than 800 strains and varieties of plants over his 55-year career as a botanist.

34) What type of rock is obsidian?

Obsidian is a naturally occurring volcanic glass formed as an extrusive igneous rock. It is produced when felsic lava extruded from a volcano cools rapidly with minimal crystal growth.

35) What is the symbol for silver?

The chemical symbol Ag is from the Latin word for "silver" -- argentum.

36) What is the most abundant element in the Universe?

Hydrogen is the lightest and most abundant element in the entire Universe, constituting roughly 75% of all baryonic mass.

37) What is the most common form of stalactites?

The most common stalactites are speleothems, which occur in limestone caves. They form through deposition of calcium carbonate and other minerals, which is precipitated from mineralized water solutions.

38) How many eggs does a queen bee lay per day?

A newly established queen bee will mate with one or more "drones." Most likely, this one mating event will allow her to lay eggs for the rest of her life. A queen bee may lay up to 2,000 eggs a day and up to 1,000,000 in her lifetime.

39) When was the steam turbine invented?

The Aeolipile, a simple steam turbine is first described by Hero of Alexandria in the 1st century AD, and many historians give him credit for the invention.

40) What was invented by Chinese astronomer and mathematician Chang Heng in 132 A.D.?

The first seismograph was invented in 132 A.D. by the Chinese astronomer and mathematician Chang Heng. It consisted of a ceramic urn with eight dragons attached to its sides. Each dragon held a small bronze ball in its mouth. Whenever there was even a slight earth tremor, a mechanism inside the seismograph would open the mouth of one dragon, and the bronze ball would fall into the open mouth of one of eight toads sitting below. Imperial watchman could tell which direction the earthquake came from by seeing which dragon's mouth was empty.