Note to users. If you're seeing this message, it means that your browser cannot find this page's style/presentation instructions -- or possibly that you are using a browser that does not support current Web standards. Find out more about why this message is appearing, and what you can do to make your experience of our site the best it can be.
Phire Hot Start DNA Polymerase

Site Tools

  • AAAS
  • Subscribe
  • Feedback

Site Search

Search Advanced

Science 7 December 2001:
Vol. 294. no. 5549, pp. 2072 - 2073
DOI: 10.1126/science.294.5549.2072b
Prev | Table of Contents | Next

News of the Week

PALEONTOLOGY:
Paring Down the Big Five Mass Extinctions

Richard A. Kerr

BOSTON--The five largest extinctions of the past half-billion years seemed immutable milestones on the path to modern life. But now a pair of paleontologists say that two of the Big Five just don't measure up. Instead, they argue, the losers should be demoted to "mass depletions": plunges in diversity caused by still-mysterious failures to produce enough new species.

Read the Full Text

ADVERTISEMENT
Click Me!

ADVERTISEMENT
Click Me!

To Advertise     Find Products

Science. ISSN 0036-8075 (print), 1095-9203 (online)