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Thync
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<p>Thync is a startup funded by <a href="/facts/Khosla_Ventures/dp008vbo">Khosla Ventures</a>, selling an electronic <a href="/facts/Wearable_technology/HBSY4P0x"> wearable device</a> it claims will improve mood. Its makers claim the device works by <a href="/facts/Neurostimulation/LueJbSze">neurostimulation</a> techniques such as <a href="/facts/Transcutaneous_electrical_nerve_stimulation/a4ctMa3y"> TENS</a> and <a href="/facts/Transcranial_direct-current_stimulation/UyxN53Dk"> tDCS</a>. </p><p>Some trial users feel no effect while others claim benefits. </p><p>One evaluator compared it to drinking an espresso accompanied by a tingle of prickly heat behind the ear. </p><p>The <a href="/facts/Food_and_Drug_Administration/rCEnh9WB">Food and Drug Administration</a> has declined to classify it as a medical device under their purview. </p>