Biology

As COVID-19 cases continue to increase, our extensive knowledge of other coronaviruses informs our understanding.

Why did sex evolve? Theories usually focus on the diversity of future generations, but some researchers find compelling explanations in the immediate benefits to individuals.

To stay healthy, humans and some other animals rely on a complex community of bacteria in their guts. But research is starting to show that those partnerships might be more the exception than the rule.

In their search for sources of genetic novelty, researchers find that some “orphan genes” with no obvious ancestors evolve out of junk DNA, contrary to old assumptions.

While the age-old chicken-and-egg paradox is easily answered, the question of infinite regress in physics is far from resolved.

A recently unearthed fossil and new genomic discoveries are filling important gaps in scientists’ understanding of how primitive green algae eventually evolved into land vegetation.

The paleontologist Pincelli Hull has nailed down the timing and speed of the extinction that killed off the dinosaurs — details that carry ominous warnings for today.

How does experience alter our perceptions? This adapted book excerpt from We Know It When We See It describes how the brain’s visual system rewires itself to make the best use of its neural resources.

We give our genes and our environment all the credit for making us who we are. But random noise during development might be just as important.