This Xenopus laevis female is shown surrounded by her newly ovulated eggs. This frog is not native to the United States, but serves as the amphibian version of a lab rat for many toxicology studies — including those measuring nitrate’s impact on reproductive hormones.
Credit: T. Barbeau.
Eruption early in human prehistory may have been more whimper than bang
Greed may breed financial fitness, but evolution allows unselfishness to survive
Fine-tuning of technique used in other animals could enable personalized medicine
Simulation suggests long-term effect on sea level not as dire as some predictions
Coverage of the 2013 American Association for the Advancement of Science meeting
The Year in Science 2012
Three-part series on the scientific struggle to explain the conscious self
Tables of contents, columns and FAQs on SN Prime for iPad