Stories by John Rennie

The rainbow of pigments that animals use for blood illustrates a central truth about evolution

Biologists have demonstrated for the first time that a controversial genetic engineering technology works, with caveats, in mammals

Carbon taxes and nuclear power will be necessary to cut CO2 emissions quickly enough to avert disastrous climate change, they say

Being under water triggers several biological responses that help to prolong breath holds

Please, Magneto, stop blaming evolution for your anger issues

A documentary about Ray Kurzweil's belief that technology could conquer mortality reveals the futurist's emotional life but fails to question his bold claims

Evidence for human interference with Earth’s climate continues to accumulate

Astronomers are finding new planets; humanitarians are improving this one

Primates can be dangerous and do harm, especially the human ones

We're an ordinary species on an ordinary planet. Or are we?

Tuberculosis has never stopped being one of the world's most lethal infections

Scientific American Editor in Chief John Rennie introduces the February 2009 issue

The naturalist would approve of how evolutionary science continues to improve

This campus features a roof growing as green as their traditional landscaping

When this world has you down, try looking at it from another one

The battle must continue, even if 25 years of research have disappointed

Understanding how novelty emerges from complex systems is a new frontier