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skiagraph

(Encyclopedia) skiagraph: see X ray.

Wray, John

(Encyclopedia) Wray, John: see Ray, John.

DK Earth: Farming

WHICH KINDS OF ANIMALS ARE DOMESTICATED? HOW HAVE MODERN CROPS BEEN DEVELOPED? WHAT ARE STAPLE FOOD CROPS? WHERE IS RICE GROWN? MECHANIZED FARMING WHAT IS ORGANIC FARMING? FIND OUT MOREThousands…

DK Science: Food Plants

PADDY FIELDS IN CHINAVERSATILE FOOD PLANTLIFE CYCLE OF RICECOMBINE HARVESTERS GATHER WHEATCROP ROTATIONSELECTIVE BREEDINGBIOGRAPHY: NORMAN BORLAUG American, 1914-PESTSFIND OUT MOREFood chains begin…

polarization of light

(Encyclopedia) polarization of light, orientation of the vibration pattern of light waves in a singular plane. Unpolarized light can be converted into a single polarized beam by means of the Nicol…

DK Science & Technology: Lenses

WHAT DOES A LENS DO? WHAT IS THE DIFFERENCE BETWEEN A MICROSCOPE AND A TELESCOPE? CONVEX LENSCONCAVE LENSFIND OUT MOREWhen you look through a magnifying glass, or take a picture with a camera, you…

observatory, orbiting

(Encyclopedia) observatory, orbiting, research satellite designed to study solar radiation, electromagnetic radiation from distant stars, the earth's atmosphere, or the like. Because the atmosphere…

virtual observatory

(Encyclopedia) virtual observatory, a collection of integrated astronomical data archives and software tools that utilize computer networks to create an environment in which research can be conducted…