Access
To read this story in full you will need to login or make a payment (see right).
News and Views
Nature 391, 643 (12 February 1998) | doi:10.1038/35519
nature jobs
Gastroenterologist
- Gastrointestinal Diseases Inc.
- Georgia, USA
Canada Research Chair (Tier 1) Alfred Bader Chair in Organic Chemistry
- Queens University
- Kingston, ON, Canada
Daedalus: Craters of doom
David Jones
The Earth is under heavenly threat. Every so often, a comet or asteroid hits it with sufficient violence to bring about a mass extinction of higher species.
To read this story in full you will need to login or make a payment (see right).

