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Central Idea #1
flow chart with central idea at the top and key details in two boxes pointing to central idea. The central idea reads: The LED lights will save energy (electricity).The left-hand key detail reads: 'Something like a fourth of our electricity consumption goes to illumination.' The right-hand key detail reads: 'Having much more light for much less electricity is really going to have a big impact.'
flow chart with central idea at the top and key details in four boxes pointing to central idea. The central idea reads: The Nobel award winners kept trying for many years until they succeeded at creating blue LEDs. The first key detail reads: The section is subtitled, ‘They Never Gave Up.’ The second key detail reads: ‘The new Nobel award winners worked for years to achieve blue LEDs.’ The third key detail reads: ‘Creating blue LEDs took about another 30 years.’ The fourth key detail reads: But these guys persisted and they tried and tried again and eventually they actually succeeded.
flow chart with central idea at the top and key details in five boxes pointing to central idea. The central idea reads: LEDs provide a greater benefit to mankind than other lightbulbs. The first key detail reads: LED bulbs are much brighter, last much longer and use much less energy than old-fashioned incandescent lightbulbs. The second key detail reads: LEDs change energy into light, without the heat. The third key detail reads: LEDs also avoid problems of fluorescent lights. The fourth key detail reads: And because ultraviolet light kills bacteria, blue LEDs could potentially be used to purify drinking water in the future, Delsing said. The fifth key detail reads: The prize is ‘to be given for inventions that benefited mankind.’