FEATURES
COVER: The bike built to win 49
With this year's Tour de France about to start, racing
teams are looking to bike designers to give them the
winning edge
Richard Gould
Cheaper alternatives for CFCs 39
How much need it really cost industrialised countries
to help the Third World's efforts to protect the
ozone layer?
Debora MacKenzie
Where did the AIDS virus come from? 54
HIV and its relatives could well have spread a few
decades ago from monkeys to people. Or maybe the
other way around
Myra McClure
"The great lake is in great peril" 58
Baikal, bigger than Belgium and older than any lake
on Earth, is threatened by industrial and agricultural
pollution
John Massey Stewart
Chaos on the circuit board 63
No electronic system is perfect. Engineers are using
chaos theory to help to understand why circuits can
misbehave
Jim Lesurf
NEWS
This Week 31
Soviet Union reopens Chernobyl file / How poor housing
increased Iranian earthquake toll / Prospects
brighten for AIDS vaccine / Penguins play lemming
/ Embryo bill leaps Commons hurdle
Science 41
A new type of genetic disease / Tap-dancing caterpillars
/ Chaos without butterflies / An epoch of galaxy
formation? / Supernova bowl / The galaxy cluster with a
magnetic attraction
Technology 44
DIY toxic waste disposal / Galoshes for horses /
Renovating old 78s / The amplifier that scrambled Sky's
movies / American anger at Japanese cameras /
Technological sunburn / Patents
VIEWPOINTS
The global lesson of AIDS 30
Life, the Universe and (almost) everything 67
Software Review 68
Packets of maths / Modem turns fax / Games to play /
Networks on the brain / Models of the quantum world
/ Smart moves in chess / How to teach hypertext / Indexing
made easy
Forum 79
End of the university as we know it / Thinking like
machines / Van Gogh's coloured vision / On being a true
green / Floppy thinking / Thistle Diary / Feedback / Enigma
Letters and Grimbledon Down 84
Ariadne 128
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