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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/5086/A.wav' data-capture-url='//staging.analytics.lingraphica.com/events/capture_news' data-article-title='Scientists: Sharks Use Earths Magnetic Field to Travel' data-article-id='5654'><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='12021'>Scientists have found that sharks use the Earth’s magnetic field as a sort of natural GPS. </span> <span data-start-time='12021' data-end-time='20500'>This permits them to swim across great distances in the world’s oceans.</span> <span data-start-time='20500' data-end-time='34813'>GPS, or Global Positioning System, is a United States government-owned service that provides users with their location on Earth. </span> <span data-start-time='34813' data-end-time='44750'>A GPS device can tell users directions from any point to another point in real-time.</span> <span data-start-time='44750' data-end-time='53500'>Researchers held experiments with a small kind of shark in a sea laboratory. </span> <span data-start-time='53500' data-end-time='61979'>They confirmed the theory that sharks use magnetic fields to guide their travels. </span> <span data-start-time='61979' data-end-time='68083'>This behavior is seen in other sea animals as well. </span> <span data-start-time='68083' data-end-time='75458'>Their study was published this month in the journal Current Biology.</span> <span data-start-time='75458' data-end-time='82104'>Bryan Keller, an expert on sea life, is one of the researchers. </span> <span data-start-time='82104' data-end-time='93333'>He said the study explained how sharks can travel the seas and find their way back to feed and produce offspring.</span> <span data-start-time='93333' data-end-time='99979'>Keller said, “We know that sharks can respond to magnetic fields.” </span> <span data-start-time='99979' data-end-time='107458'>But scientists did not know that they use magnetic fields to help direct them. </span> <span data-start-time='107458' data-end-time='117563'>He noted that “You have sharks that can travel 20,000 kilometers and end up in the same spot.”</span> <span data-start-time='117563' data-end-time='124854'>Researchers have questioned how sharks perform long-distance traveling for years. </span> <span data-start-time='124854' data-end-time='137708'>Sharks make their trips in the open ocean where they pass few physical features such as corals that could serve as landmarks.</span> <span data-start-time='137708' data-end-time='149021'>Looking for answers, scientists based at Florida State University decided to study a small kind of shark called a bonnethead. </span> <span data-start-time='149021' data-end-time='158958'>The bonnethead shark they studied lives on both American coasts and returns to the same waters every year.</span> <span data-start-time='158958' data-end-time='172250'>Researchers created magnetic conditions to make 20 bonnethead sharks think they were hundreds of kilometers away from where they were caught off Florida. </span> <span data-start-time='172250' data-end-time='177771'>The scientists found that the sharks began to swim north. </span> <span data-start-time='177771' data-end-time='185646'>This was due to the magnetic conditions that made them think they were south of where they should be.</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/5086/A.jpeg'/></div></div><div id='question-content' style='display:none;'><div class='vocabulary_question question-container' data-question-id=17464 data-hint-location='93333' style='display:none;'><div class='question' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/5086/what_does_it_mean_to_respond.wav'>What does it mean to respond?</div><div class='choices' data-correct-choice='To have a particular reaction to something'><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/5086/to_have_a_particular_reaction_to_something.wav'><span>To have a particular reaction to something</span></div><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/5086/to_have_a_particular_preference_and_make_it_known.wav'><span>To have a particular preference and make it known</span></div><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/5086/to_provide_with_a_fresh_supply.wav'><span>To provide with a fresh supply</span></div><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/5086/to_breathe_artificially.wav'><span>To breathe artificially</span></div></div></div><div class='multiple_choice_question question-container' data-question-id=17465 data-hint-location='137708' style='display:none;'><div class='question' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/5086/what_type_of_shark_did_the_researchers_study.wav'>What type of shark did the researchers study?</div><div class='choices' data-correct-choice='bonnethead'><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/5086/bonnethead.wav'><span>bonnethead</span></div><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/5086/large.wav'><span>large</span></div><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/5086/white.wav'><span>white</span></div><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/5086/tiger.wav'><span>tiger</span></div></div></div><div class='sentence_completion_question question-container' data-question-id=17466 data-hint-location='20500' style='display:none;'><div class='question' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/5086/gps_or__blank__is_a_united_states_governmentowned_service_that_provides_users_with_their_location_on_earth_.wav'>GPS, or <span class='blank'>Global Positioning System</span>, is a United States government-owned service that provides users with their location on Earth. </div><div class='choices' data-correct-choice='Global Positioning System'><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/5086/global_polar_scanner.wav'><span>Global Polar Scanner</span></div><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/5086/good_pal_satellite.wav'><span>Good Pal Satellite</span></div><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/5086/great_pointer_shark.wav'><span>Great Pointer Shark</span></div><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/5086/global_positioning_system.wav'><span>Global Positioning System</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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