Nhật chế tạo cặp đồng hồ chính xác nhất thế giới
Cập nhật: 15:24 24/02/2015 GMT+7
Các nhà khoa học Nhật Bản chế tạo một cặp đồng hồ có độ chính xác cao, chỉ mất một giây trong 16 tỷ năm.
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