메타물질 음파를 이용 트렉터를 들어올리다 유리판 하나에 엄청난 힘이 숨어 있다

<p style="text-align: left;">이 평평한 유리판 하나에는<br>엄청난 힘이 숨어 있습니다<br>음파를 조종해서 트렉터를 들어올리고<br>빛을 조종해서 3D영상도 만들수 있죠<br><a href="https://youtu.be/EIfr0nWGBNY?si=dgTvsEv8upKBVuHA" target="_blank" class="ke-link">https://youtu.be/EIfr0nWGBNY?si=dgTvsEv8upKBVuHA</a></p><div class="figure-video" data-ke-type="video" data-video-url="https://www.youtube.com/watch?v=EIfr0nWGBNY" data-video-host="youtube" data-video-play-service="daum_cafe" data-video-width="1280" data-video-height="720" data-ke-style="alignCenter" data-video-thumbnail="http://scrap.kakaocdn.net/dn/kTsBJ/dJMb8TCx7vw/6Ivd2X1W9mK7Qr46aWsf21/kakaolink40_original.jpg?width=1280&height=720" data-ke-mobile-mobilestyle="widthFull" data-video-origin-width="1280" data-video-origin-height="720"><iframe src="https://www.youtube.com/embed/EIfr0nWGBNY" width="1280" height="720" frameborder="0" scrolling="no" allowfullscreen=""></iframe><div class="figcaption"></div></div><p style="text-align: left;"><br></p><div class="figure-img" data-ke-type="image" data-ke-style="alignCenter" data-ke-mobilestyle="widthOrigin"><img src="https://t1.daumcdn.net/cafeattach/15ovt/18c0c8d27ae3859e531d24af633ae6704526ed2a" class="txc-image" data-img-src="https://t1.daumcdn.net/cafeattach/15ovt/18c0c8d27ae3859e531d24af633ae6704526ed2a" data-origin-width="720" data-origin-height="1280"></div><div class="figure-img" data-ke-type="image" data-ke-style="alignCenter" data-ke-mobilestyle="widthOrigin"><img src="https://t1.daumcdn.net/cafeattach/15ovt/4c3cae8b3783f80df86e0250c23a1c730b7a07d7" class="txc-image" data-img-src="https://t1.daumcdn.net/cafeattach/15ovt/4c3cae8b3783f80df86e0250c23a1c730b7a07d7" data-origin-width="720" data-origin-height="436"></div><div class="figure-img" data-ke-type="image" data-ke-style="alignCenter" data-ke-mobilestyle="widthOrigin"><img src="https://t1.daumcdn.net/cafeattach/15ovt/10908a8f252085c1871e61e5463b4c819843f0f1" class="txc-image" data-img-src="https://t1.daumcdn.net/cafeattach/15ovt/10908a8f252085c1871e61e5463b4c819843f0f1" data-origin-width="720" data-origin-height="707"></div><p style="text-align: left;"></p>