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Snowball Earth

Ice entombed our planet hundreds of millions of years ago, and complex animals evolved in the greenhouse heat wave that followed

By Paul F. Hoffman and Daniel P. Schrag


Although people with the disorder do not fall face-first into their soup as in the movies, narcolepsy is still a mysterious disease. But science has new leads

By Jerome M. Siegel

The Nobel Prizes for 1999

Explanations of the science underlying the world's most prestigious awards for physics, chemistry and physiology plus a look at the prizes for peace, won by a physicians organization, and economics

By Carol Ezzell, Glenn Zorpette, Graham P. Collins and Sasha Nemecek

Once We Were Not Alone

Today we take for granted that Homo sapiens is the only hominid on Earth. Yet for at least four million years many hominid species shared the planet. What makes us different?

By Ian Tattersall

Voyage to SUPERHEAVY Island

The synthesis of element 114 confirmed decadesold theoretical predictions of a little patch of nuclear stability in a sea of shortlived superheavy nuclei

By Kenton J. Moody, Vladimir K. Utyonkov and Yuri Ts. Oganessian

Maglev: A New Approach

The Inductrack promises a safer, cheaper system for magnetically levitating trains. The same technology can also be used to launch rockets

By Richard F. Post

The Unmet Need for Family Planning

Women and men in many countries still lack adequate access to contraceptives. Unless they are given the option of controlling their fertility, severe environmental and health problems loom in the coming century throughout large parts of the world

By Malcolm Potts


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