科学60秒:X光——透射生活的美好
X-rays are so common today you probably never stop to think about them. They help check a broken wrist, a sprained ankle, the state of our teeth. But a little more than a century ago, x-ray machi
The History of Chemistry
音乐的语言The Language of Music A painter hangs his or her finished pictures on a wall, and everyone can see it. A composer writes a work, but no one can hear it until it is performed. Professi...
诗歌:永远的朋友
诗歌A friend walk in when the rest of the world walks out. A Forever Friend Sometimes in life, You find a special friend; Someone who changes your life just by being part ...
塑胶中的化学物质 (1)
Hints: Bisphenol A;polycarbonate plastic Bisphenol A is a chemical widely used to make hard, polycarbonate plastic. Food storage containers, reusable water bottles and baby bottles are among the ...