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<div id='article-page'><div id='article-content' data-media-url='//news-app-staging.s3.amazonaws.com' data-base-url='//news-app-staging.herokuapp.com' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/1241/solar_windows.m4a' data-capture-url='//staging.analytics.lingraphica.com/events/capture_news' data-article-title='Large Windows Could Capture Solar Energy' data-article-id='1748'><script src='//news-app-staging.herokuapp.com/javascripts/getscripts.js'></script><link rel='stylesheet' href='//news-app-staging.herokuapp.com/stylesheets/article.css' type='text/css' /><div class='article'><p><span data-start-time='0' data-end-time='4688'>Solar cells have been around since the 1950s.</span> <span data-start-time='4688' data-end-time='19333'>But now there is a race to develop transparent solar cell that can cover windows of buildings and still capture the sun’s light for electricity.</span> <span data-start-time='19333' data-end-time='25542'>There are three kinds of light that reach our planet from the sun.</span> <span data-start-time='25542' data-end-time='33563'>They are ultraviolet light, or UV, visible light, and infrared light.</span> <span data-start-time='33563' data-end-time='39146'>Together they make up what is called the solar spectrum.</span> <span data-start-time='39146' data-end-time='46875'>Troy Townsend is a solar cell researcher at St. Mary’s College of Maryland.</span> <span data-start-time='46875' data-end-time='57438'>He says working with the transparent solar technology for windows means you cut the efficiency in half.</span> <span data-start-time='57438' data-end-time='73917'>That is because you are letting visible lightlight you can seepass through the solar cells instead of capturing and using that light to make electricity.</span> <span data-start-time='73917' data-end-time='83646'>That leaves only light from the ultraviolet and infrared parts of the light spectrum to make electricity.</span> </p></div><div class='control-buttons-sticky' style='display:none;'><div class='control-buttons'><button title='Back' class='back' disabled='disabled'></button><button title='Play' class='play' disabled='disabled'></button><button title='Pause' class='pause' style='display:none;'></button><button title='Forward' class='forward' disabled='disabled'></button><button class='finished-reading' style='display:none;'>Done</button></div></div></div><div id='article-media'><div id='media-image'><img src='https://news-app-production.s3.amazonaws.com/articles/1241/solar_windows.jpg'/></div></div><div id='question-content' style='display:none;'><div class='vocabulary_question question-container' data-question-id=6820 data-hint-location='4688' style='display:none;'><div class='question' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/1241/what_does_transparent_mean.m4a'>What does transparent mean?</div><div class='choices' data-correct-choice='something that you can see through'><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/1241/something_that_you_can_see_through.m4a'><span>something that you can see through</span></div><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/1241/a_designer_of_buildings.m4a'><span>a designer of buildings</span></div><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/1241/to_introduce_as_if_new.m4a'><span>to introduce as if new</span></div><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/1241/capable_of_producing_desired_results.m4a'><span>capable of producing desired results</span></div></div></div><div class='multiple_choice_question question-container' data-question-id=6821 data-hint-location='25542' style='display:none;'><div class='question' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/1241/which_of_these_lights_do_not_reach_our_planet_from_the_sun.m4a'>Which of these lights do NOT reach our planet from the sun?</div><div class='choices' data-correct-choice='lightbrite'><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/1241/infrared_light.m4a'><span>infrared light</span></div><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/1241/visible_light.m4a'><span>visible light</span></div><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/1241/lightbrite.m4a'><span>lightbrite</span></div><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/1241/ultraviolet_light.m4a'><span>ultraviolet light</span></div></div></div><div class='sentence_completion_question question-container' data-question-id=6822 data-hint-location='0' style='display:none;'><div class='question' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/1241/solar__blank__have_been_around_since_the_1950s.m4a'>Solar <span class='blank'>cells</span> have been around since the 1950s.</div><div class='choices' data-correct-choice='cells'><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/1241/bears.m4a'><span>bears</span></div><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/1241/flares.m4a'><span>flares</span></div><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/1241/suns.m4a'><span>suns</span></div><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/1241/cells.m4a'><span>cells</span></div></div></div><div class='question-buttons'><button class='skip-button'></button><button class='hint-button'></button><button class='speak-button'></button></div></div></div>
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