Astronomers can tell just how hot the surface of the moon gets. The side of the moon toward the sun gets two degrees hotter than boiling water. The ni...
Digital television is based on the idea of recording information in a digital, rather than an analogue format（模拟形式）. The idea is to reduce the informa...
There are two categories of networks: local area networks (LANs) and wide area networks (WANs). Here I'd like to mainly talk about LAN.A LAN is a ...
Many networks are managed by a computer called a file server.A file server has a large－capacity hard disk and special software that manages access to ...
Novell's Net ware has become the strongest competitor to IBM's own network operating environment and predates IBM in its support for LANs. In ...
Racing across the universe for the last 7.3 billion years, two gamma-ray photons（光子，光量子） arrived at NASA's orbiting Fermi Gamma-ray Space Telescop...
Human embryonic stem cells（胚胎干细胞） derived from excess IVF embryos（晶胚） may help scientists unlock the mysteries of infertility（不肥沃，不毛） for other couple...
Researchers at the University of Illinois at Chicago College of Medicine have shown that adult stem cells from bone marrow（骨髓） can prevent acute lung ...
As the nation copes with a shortage of vaccines for H1N1 influenza, a team of Alabama researchers have raised hopes that they have found an Achilles&#...
A new European Earth observation satellite will be launched in the early hours of Monday morning (2 November 2009) from the Plesetsk Cosmodrome in nor...