Đức chế tạo máy quay siêu nhỏ không lớn hơn một hạt muối
Theo một nghiên cứu đăng tải trên tạp chí Nature Photonics, các kỹ sư người Đức vừa chế tạo được một máy quay ​siêu nhỏ với kích thước không lớn hơn một hạt muối.
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