How Heat Damages Human Hair
<p><span word="Many">Many</span> <span word="women">women</span> <span word="and">and</span> <span word="some">some</span> <span word="men">men</span> <span word="are">are</span> <span word="very">very</span> <span word="particular">particular</span> <span word="about">about</span> <span word="their">their</span> <span word="hair">hair</span>. <span word="One">One</span> <span word="of">of</span> <span word="the">the</span> <span word="ways">ways</span> <span word="for">for</span> <span word="keeping">keeping</span> <span word="it">it</span> <span word="in">in</span> <span word="shape">shape</span> <span word="involves">involves</span> <span word="applying">applying</span> <span word="heat">heat</span>, <span word="but">but</span> <span word="just">just</span> <span word="how">how</span> <span word="much">much</span> <span word="of">of</span> <span word="it">it</span> <span word="and">and</span> <span word="for">for</span> <span word="how">how</span> <span word="long">long</span> <span word="has">has</span> <span word="been">been</span> <span word="mostly">mostly</span> <span word="left">left</span> <span word="to">to</span> <span word="experience">experience</span>. <span word="A">A</span> <span word="scientist">scientist</span> <span word="from">from</span> <span word="Purdue">Purdue</span> <span word="University">University</span>, <span word="Indiana">Indiana</span>, <span word="is">is</span> <span word="trying">trying</span> <span word="to">to</span> <span word="find">find</span> <span word="a">a</span> <span word="scientific">scientific</span> <span word="answer">answer</span>.</p><p> <span word="Some">Some</span> <span word="people">people</span> <span word="who">who</span> <span word="have">have</span> <span word="naturally">naturally</span> <span word="curly">curly</span> <span word="hair">hair</span> <span word="prefer">prefer</span> <span word="to">to</span> <span word="have">have</span> <span word="it">it</span> <span word="straightened">straightened</span>.</p><p><span word="Others">Others</span> <span word="with">with</span> <span word="straight">straight</span> <span word="hair">hair</span> <span word="want">want</span> <span word="to">to</span> <span word="have">have</span> <span word="curls">curls</span>.</p><p> "<span word="It">It</span> <span word="is">is</span> <span word="kind">kind</span> <span word="of">of</span> <span word="like">like</span> <span word="the">the</span> <span word="way">way</span> <span word="I">I</span> <span word="see">see</span> <span word="the">the</span> <span word="world">world</span>, <span word="like">like</span> <span word="the">the</span> <span word="lens">lens</span> <span word="through">through</span> <span word="which">which</span> <span word="I">I</span> <span word="see">see</span> <span word="the">the</span> <span word="world">world</span> <span word="and">and</span> <span word="I">I</span> <span word="always">always</span> <span word="was">was</span> <span word="wondering">wondering</span> <span word="about">about</span> <span word="how">how</span> <span word="we">we</span> <span word="can">can</span> <span word="think">think</span> <span word="about">about</span> <span word="this">this</span> <span word="from">from</span> <span word="a">a</span> <span word="mechanical">mechanical</span> <span word="engineering">engineering</span> <span word="perspective">perspective</span>," <span word="explains">explains</span> <span word="Tahira">Tahira</span> <span word="Reid">Reid</span>, <span word="assistant">assistant</span> <span word="professor">professor</span> <span word="of">of</span> <span word="Mechanical">Mechanical</span> <span word="Engineering">Engineering</span> <span word="at">at</span> <span word="Purdue">Purdue</span> <span word="University">University</span>.</p><p> <span word="Hair">Hair</span> <span word="irons">irons</span> <span word="can">can</span> <span word="take">take</span> <span word="many">many</span> <span word="shapes">shapes</span> <span word="but">but</span> <span word="are">are</span> <span word="essentially">essentially</span> <span word="clips">clips</span> <span word="or">or</span> <span word="rods">rods</span> <span word="with">with</span> <span word="heated">heated</span> <span word="surfaces">surfaces</span>.</p><p> "<span word="If">If</span> <span word="you">you</span> <span word="go">go</span> <span word="to">to</span> <span word="the">the</span> <span word="mall">mall</span> <span word="right">right</span> <span word="now">now</span> <span word="you">you</span> <span word="see">see</span> <span word="an">an</span> <span word="aisle">aisle</span> <span word="full">full</span> <span word="of">of</span> <span word="straightening">straightening</span> <span word="irons">irons</span>, <span word="and">and</span> <span word="they">they</span> <span word="have">have</span> <span word="terms">terms</span> <span word="like">like</span> <span word="ion">ion</span> <span word="technology">technology</span> <span word="and">and</span> <span word="twirling">twirling</span>," <span word="notes">notes</span> <span word="Amy">Amy</span> <span word="Marconnet">Marconnet</span>, <span word="also">also</span> <span word="an">an</span> <span word="Assistant">Assistant</span> <span word="Professor">Professor</span> <span word="of">of</span> <span word="Mechanical">Mechanical</span> <span word="Engineering">Engineering</span> <span word="at">at</span> <span word="Purdue">Purdue</span> <span word="University">University</span>.</p><p> <span word="The">The</span> <span word="heat">heat</span> <span word="weakens">weakens</span> <span word="or">or</span> <span word="breaks">breaks</span> <span word="a">a</span> <span word="protein">protein</span> <span word="called">called</span> <span word="keratin">keratin</span>, <span word="responsible">responsible</span> <span word="for">for</span> <span word="the">the</span> <span word="hair">hair</span>'<span word="s">s</span> <span word="shape">shape</span>, <span word="and">and</span> <span word="temporarily">temporarily</span> <span word="changes">changes</span> <span word="it">it</span>. <span word="But">But</span> <span word="nobody">nobody</span> <span word="knows">knows</span> <span word="exactly">exactly</span> <span word="at">at</span> <span word="what">what</span> <span word="level">level</span> <span word="the">the</span> <span word="heat">heat</span> <span word="can">can</span> <span word="actually">actually</span> <span word="cause">cause</span> <span word="permanent">permanent</span> <span word="damage">damage</span>.</p><p> "<span word="If">If</span> <span word="we">we</span> <span word="understand">understand</span> <span word="the">the</span> <span word="onset">onset</span> <span word="at">at</span> <span word="which">which</span> <span word="that">that</span> <span word="happens">happens</span> <span word="than">than</span> <span word="we">we</span> <span word="might">might</span> <span word="be">be</span> <span word="able">able</span> <span word="to">to</span> <span word="intervene">intervene</span> <span word="before">before</span> <span word="or">or</span> <span word="give">give</span> <span word="some">some</span> <span word="suggestions">suggestions</span> <span word="before">before</span> <span word="you">you</span> <span word="get">get</span> <span word="to">to</span> <span word="that">that</span> <span word="point">point</span>," <span word="Reid">Reid</span> <span word="says">says</span>.</p>
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