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ۼ : 18-11-21 22:31
[과학 ?상] ???
 ۾ :
ȸ : 42  

3?의 ?상??바로 ???면 ?로고침?세??

??? ?떻??아?는 걸까? / YTN ?이?스 - YouTube
<iframe style="max-width: 100%;" width="854" height="480" src="//www.youtube.com/embed/ICVrmosZnio" frameborder="0" allow="autoplay; encrypted-media" allowfullscreen> </iframe>
? http://www.youtube.com/watch?v=ICVrmosZnio

2:25
Why Do Boomerangs Come Back?
SciShow
<iframe style="max-width: 100%;" width="854" height="480" src="//www.youtube.com/embed/SJ61Y17s3bU" frameborder="0" allow="autoplay; encrypted-media" allowfullscreen> </iframe>
? http://www.youtube.com/watch?v=SJ61Y17s3bU

2:44
Why Do Boomerangs Come Back? | Earth Lab
BBC Earth Lab
<iframe style="max-width: 100%;" width="854" height="480" src="//www.youtube.com/embed/d3eBj-NnYLM" frameborder="0" allow="autoplay; encrypted-media" allowfullscreen> </iframe>
? http://www.youtube.com/watch?v=d3eBj-NnYLM