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Males Are the Taller Sex. Estrogen, Not Fights for Mates, May Be Why.
To explain why men are on average taller than women, scientists theorized about competition for mates. But the effects of estrogen on bone growth may be answer enough.
Out-of-Sync ‘Loners’ May Secretly Protect Orderly Swarms
Studies of collective behavior usually focus on how crowds of organisms coordinate their actions. But what if the individuals that don’t participate have just as much to tell us?
Egg Laying or Live Birth: How Evolution Chooses
A lizard that both lays eggs and gives birth to live young is helping scientists understand how and why these forms of reproduction evolved.
Inside Deep Undersea Rocks, Life Thrives Without the Sun
Newly discovered worlds of microbes far beneath the ocean floor, inside old basaltic rocks, could point to a greater likelihood of life elsewhere in the universe.
What Other Coronaviruses Tell Us About SARS-CoV-2
As COVID-19 cases continue to increase, our extensive knowledge of other coronaviruses informs our understanding.
Why Sex? Biologists Find New Explanations.
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.
Some Animals Have No Microbiome. Here’s What That Tells Us.
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.
Where Do New Genes Come From?
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.
Billion-Year-Old Algae and Newer Genes Hint at Land Plants’ Origin
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.