地球的旋轉時(shí)間變短 We have been talking about some of the effects that the human beings had on the earth. One you may not be aware of is that we actually begin to change the length of the day. In the
polymer gels一種聚合凝膠 The following information was part of our display for the SET96 and SET98 Scientific Power to the People Exhibition, TheGalleries, Bristol, 20th and 21st March 1998. A POLYME
Backgrounds of washington Map of Federal City, 1797 Historical Society of Washington, DC The plan of the city of Washington was designed in 1791 by Pierre L Enfant, and mapped the following year; a d
About nautilus and king nautilus By 1986, Saunders and I had collected tissue from nautiluses around Fiji, Samoa, Australia, New Guinea, the Philippines, Palau, and New Caledonia. Two independent seq
What is p53 ? After the identification of the p53 protein and the subsequent cloning of p53 genes from several species, early observations suggested that p53 may function as an oncogene, because over
the code of Hammurabi Hammurabi was the ruler who chiefly established the greatness of Babylon, the world s first metropolis. Many relics of Hammurabi s reign ([1795-1750 BC]) have been preserved, an
Lava Lava is magma that breaks the surface and erupts from a volcano. If the magma is very fluid, it flows rapidly down the volcano s slopes. Lava that is more sticky and less fluid moves slower. Lav
A Brief History of the Guitar There is evidence that a four string, guitar-like instrument was played by the Hittites (who occupied a region now known as Asia Minor and Syria) around 1400 BC. It had
jazz的完整歷史 The roots of jazz The folk songs and plantation dance music of black Americans contributed much to early jazz. These forms of music occurred throughout the Southern United States durin
