11.txt

搜索邀请的改进算法

		
		
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		If you've ever played Maxis' classic game SimCity 2000 
you'll understand my fascination with this National 
Geographic feature on the secret underground workings of 
the Big Apple. Using interesting images and informative 
text the pages take you on a tour of the support systems 
that fuel the city. You can also take an audio tour of the 
feature and browse an extensive photo archive filled with 
unforgettable images.
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<a href="http://www.nature.com/">Nature</A><BR>
		
		
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		This prestigious weekly journal of science 
has an impressive Web site. Like 
Scientific American, Nature serves web-
exclusive content, which changes 
frequently. In addition to the articles you'll 
find a comprehensive calendar of science 
events, a listing of industry job openings 
and an archive of published material 
dating back to 1995. Nature's web 
designers have taken great care to make 
the site compatible with almost any 
browser (including the command line 
Lynx). They provide excellent navigation 
aids and pleasant graphics that don't take 
forever to load.
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<a href="http://www.omsi.edu/">OMSI</A><BR>
		
		
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		When the basement 
flooded in 1996 the future 
of Portland's venerable 
OMSI  was in doubt.  
Now their loan is payed off 
and the future of the 
Oregon Museum of 
Science and Industry looks 
bright.  From the OMSI site 
you can read about 
upcoming shows,  check 
out the OmniMax theater 
schedule and even take a 
peek at the live Rat Cam.
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<a href="http://pdg.lbl.gov/cpep/adventure.html">The Particle Adventure</A><BR>

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		 A Brief History of Time may start with the Big Bang but it ends
small. A Particle Adventure. The theory of fundamental particles and forces
is called the Standard Model. Some physicists want to go beyond it. Join
this crew from CERN, Lawrence Livermore, Russia, Japan and the UK on a
quest to explore the frontier, warping time, space and the universe as we
know it.
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<a href="http://www.scienceagogo.com/">Science a GoGo</A><BR>
		
		
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		Look in the local paper of just about any American town 
and you'll find the kind of whiz-bang science tidbits that 
make up the bulk of Science a GoGo. These short pieces are 
fun to browse and cover a range of topics from the benefits 
of a fish diet to the cause of the death of Alexander the 
Great. Make sure and keep your skeptic's hat on when you read 
these snippets, none of these articles are in-depth enough 
to be truly authoritative.
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<a href="http://www.scicentral.com/">SciCentral</A><BR>
		
		
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		SciCentral is a clearing house of links to science related sites 
around the 'net. It's updated frequently, logically organized 
and simple to navigate. From here you'll be able to find sites 
on just about any science and technology topic you're interested in.
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<a href="http://www.sciam.com/">Scientific American</A><BR>
		
		
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		Scientific American is one of the best 
popular science journals. Established in 
1845, it has maintained a focus on key 
technological advancements. The web 
version of Scientific American is more 
than a reproduction of its current 
newsstand counterpart. It's filled with 
exclusive content updated weekly, a 
really cool section called 'Ask the Experts' 
and a great list of science related 
bookmarks.
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<TD VALIGN="TOP" BGCOLOR="#EEEEEE"><a href="http://www.seti-inst.edu/">The SETI Institute</A><BR>
		
		
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		You could spend days pouring over all 
the information at the SETI (Search Extra Terrestrial Intelegence) Institute  
home page. The Mountain View CA 
organization is the official home site of 
SETI and it's sister project Phoenix. 
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<a href="http://heasarc.gsfc.nasa.gov/docs/www_info/webstars.html">WebStars</A><BR>
		
		
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		Created by the High Energy Astrophysics 
Science Archive Research Center at 
NASA's Goddard Space Flight Center, 
WebStars is an index of resources for 
people with a general interest in 
Astronomy.  The page is beautifully 
designed with images of stars,  planets 
and comets.  Main areas of the index 
cover the Solar System, Astronomical 
Images, the Exploration of Mars and the 
History of Astronomy.
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<a href="http://pds.jpl.nasa.gov/planets/">Welcome to the Planets.</A><BR>
		
		
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		When I was a boy the only planet other than the Earth we knew much about was the Moon. One of my fondest memories is sitting with my family (I was 5) watching Neil Armstrong take that one small step. The last twenty-five years 
have seen an explosion of data gleaned from the exploration of our solar system. Welcome to the Planets is NASA's clearinghouse of that data with sectionscontaining images, data and links galore on each of Earth's eight sisters.
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<a href="http://whyfiles.news.wisc.edu/">The Why Files</A><BR>
		
		
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		The Why Files is designed to provide readers 
with the knowledge they need to make an informed evaluation of scientific headlines. Funded by the National Science Foundation, the Why Files rolls authoritative information into a fun and easy to use interface.
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<a href="http://www.exploratorium.edu/ronh/weight/index.html">Your Weight on Other Worlds</A><BR>
		
		
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		Weight conversions for all nine 
planets (the Moon stands in for Earth), four extraterrestrial 
moons and three stars are available along with a good 
introduction to the science of gravitation and mass.
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Site design &copy; 1998, <a href="http://www.teleport.com/~chrish/">Digital Sunrise</a>. Comments to 
<a href="mailto:[e-mail]">Chris Hughes</a>.  
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