Today’s extinction rates are sky-high. But scientists debate if that’s sufficient evidence to conclude that Earth is undergoing a mass extinction event—or whether that’s even a helpful designation.

DNA passed to and from all kinds of organisms, even across kingdoms, has helped shape the tree of life, to a large and undisputed degree in microbes and also unexpectedly in multicellular fungi, plants, and animals.

Researchers are turning to the immune system for help in treating addiction and preventing overdose.

Many species of birds and other vertebrates form pair bonds and mate with just one other individual for much of their lives. But the unions don’t always work out. Scientists want to know the underlying factors.

Only recently appreciated as critical components of cellular functions, unstructured stretches of amino acids called SLiMs are key to viral-host interactions.

New techniques have shown that people reached the New World far earlier than the long-standing estimate of 13,000 years ago, but scientists still debate exactly when humans arrived on the continent—and how.

Several lines of evidence suggest that targeting the body’s defense pathways might help treat a subset of people with the psychiatric disorder. But many open questions remain.

The concept of epigenetic inheritance has long been controversial. Some researchers hope that new data on cross-generational effects of environmental exposures will help settle the debate.

A growing appreciation of the bacterial assemblages that live within tumors has researchers striving to understand and capitalize on their role.

A new link between inflammation and rampant chromosomal abnormalities reveals novel strategies to treat diverse malignancies.

Corals that previously experienced heat stress respond better the next time around. Researchers are trying to figure out how, and hope to one day take advantage of the phenomenon to improve coral restoration efforts. 

Researchers explore the idea that molecular patterns in individual cells could underlie the development of a left and a right in animals.

Long lambasted as junk DNA or genomic parasites, transposable elements turn out to be contributors to adaptation.

Dozens of researchers, including myself, worked for years to uncover that swine flu had leapt to humans from a pig in Mexico in 2009. We learned a lot about influenza evolution, pig farming, and outbreak risk along the way.

Immunologists and parasitologists are working to revive the idea that helminths, and more specifically the molecules they secrete, could help treat allergies and autoimmune disease.

The COVID-19 pandemic is still with us. Biomedical innovation has rallied to address that pressing concern while continuing to tackle broader research challenges.

Certain stretches of DNA that regulate gene expression have evolved differently from protein-coding genes.

Recent findings buck the traditional idea that embryos are passive agents and instead suggest that by tuning into vibrations, organisms can better prepare to enter the outside world.

Our perception of quantity, separate from counting or estimation of magnitude more generally, is foundational to human cognition, according to some neuroscientists.