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61) How many legs do spiders have?

All spiders have eight legs. They also possess a pair of shorter limbs called pedipalps, that in males serve as sex organs. Some spiders seem to have ten legs and not eight, because these pedipalps look like an extra pair of legs.

62) How many miles of blood vessels are there in the human body?

If you took all the blood vessels out of an average adult and laid them out in a line, it would stretch about 100,000 miles.

63) What discovery earned Wilhelm Rontgen the first Nobel Prize for Physics?

Wilhelm Conrad Roentgen earned the first Nobel Prize in Physics for his discovery of electromagnetic radiation in a wavelength range -- commonly known as X-rays today.

64) Why are sharks and rays different from other fish?

Shark and rays are different from other fish because they have no bones. Their skeletons are made of cartilage, which is flexible and durable with about half the normal density of bone.

65) Which of the following is NOT a mineral?

A mineral is a naturally occurring inorganic solid with a definite chemical composition and an ordered internal structure. Although wood is a naturally occurring solid, it is an organic material, so it is not a mineral.

66) What is the smallest biological unit of a living organism?

Often called the "building blocks of life", cells are the basic structural, functional, and biological unit of all known living organisms.

67) What is the symbol for Potassium?

Potassium is a chemical element with symbol K (derived from Neo-Latin, kalium) and atomic number 19. It was first isolated from potash, the ashes of plants, from which its name derives.

68) What scientist discovered X-rays?

German physicist Wilhelm Röntgen is usually credited with the discovery of X-rays in 1895, because he was the first to systematically study them, though he is not the first to have observed their effects. He is also the one who gave them the name "X-rays" (signifying an unknown quantity).

69) Who invented the telescope?

It is commonly believed that Italian astronomer Galileo Galilei invented the telescope, but the earliest known record of a refracting telescope is in fact credited to German-Dutch spectacle-maker Hans Lippershey who filed a patent for the device in 1608.

70) What has the highest atomic number of any non-radioactive element?

Lead has the highest atomic number of any non-radioactive element, although the next higher element, bismuth, has one isotope with a half-life that is long enough (over one billion times the estimated age of the universe) to be considered stable for all practical purposes.