Answer:
The discovery of bronze allowed civilizations to expand and use new tools, advance building and forging methods that could implement new and inventive...
Explanation:
Civilizations in Greece began working withbronze before 3000 B.C., while the British Isles and China entered the Bronze Age much later—around 1900 B.C. and 1600 B.C., respectively. The Bronze Age was marked by the rise of states or kingdoms—large-scale societies joined under a central government by a powerful ruler.
<em>Baruch S. Blumberg invented </em><span><em>a vaccine for smallpox for which he won noble prize in 1976.</em></span>
Answer:
While you may have some incandescent bulbs lying around, once they're gone, they will be gone forever. And you probably won't mourn their inefficiency; since about 90 percent of the energy produced in the bulbs is actually heat instead of light, they are huge energy wasters. While they generally last about 1,500 hours, this is still only a fraction of the lifespan of CFLs. These are lit by an electric current sent through a tube that contains argon and a small amount of mercury gases. These gases generate invisible ultraviolet light, which commingles with a fluorescent coating on the inside of the tube to produce light.
Explanation:
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