拿个博士学位回家(2)

科学60秒:“精灵”相机的珍贵照片

Cameras were once . Today, really good cameras fit in your pocket. And now, researchers at Cornell have developed a camera that’s just a half-millimeter on each side and a hundredth of a millime...

美文欣赏:坚持的意义

美文欣赏:坚持的意义Dig a Little Deeper There's a story about the California gold rush that tells of two brothers who sold all they had and went prospecting for gold. They discovered a vein of t

文化：多年前廉价拍售的画疑出自达芬奇之手

文化：多年前廉价拍售的画疑出自达芬奇之手A painting purchased for 20,000 dollars at an art auction a couple of years ago, maybe an undiscovered work by Leonardo Da Vinci. A forensic expert says fi...