Vòng kim cương nhỏ nhất thế giới
Các nhà khoa học Úc thông báo đã chế tạo chiếc vòng kim cương nhỏ nhất thế giới với đường kính 5 micron (1 micron = 1 phần triệu mét) và dày 300 nanomet (1 nanomet = 1 phần tỷ mét).
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