Magnetic resonance imaging (MRI) is a noninvasive medical test that physicians use to diagnose and treat medical conditions.MRI uses a powerful magnetic field, radio frequency pulses and a computer to produce detailed pictures of organs, soft tissues, bone and virtually all other internal body structures.agnetic resonance imaging (MRI) is a noninvasive medical test that physicians use to diagnose and treat medical conditions.
The Guangxu Emperor (14 August 1871 â 14 November 1908), personal name Zaitian (Manchu: Dzai-Tiyan), was the eleventh emperor of the Qing dynasty, and the ninth Qing emperor to rule over China. His reign lasted from 1875 to 1908, but in practice he ruled, under Empress Dowager Cixi's influence, only from 1889 to 1898.
Cai Lun, courtesy name Jingzhong, was a Chinese eunuch, inventor, and politician of the Han dynasty. He is traditionally regarded as the inventor of paper and the papermaking process, in forms recognizable in modern times as paper. Although early forms of paper had existed in China since the 2nd century BCE, he was responsible for the first significant improvement and standardization of papermaking by adding essential new materials into its composition.