Scientists have solved a 66 million year old mystery about why the earth cooled after the age of the dinosaurs.

Engineered “biochar” made from waste wood and natural clay minerals could help buildings stay comfortable while cutting energy use for cooling by nearly a quarter, according to a new study in the journal Biochar.

Biochar, a charcoal like material made from plant and organic waste, is often promoted as a climate and soil “wonder solution,” but a new commentary warns that the reality is far more complex and that smarter deployment is urgently needed. The authors argue that biochar will only move from the margins to the mainstream if treated as part of a larger system that links technology, economics, and public policy.

A new device, designed by researchers at the University of Colorado Boulder and University of Colorado Anschutz, jiggles red blood cells until they break apart—revealing valuable information about their quality. 

Ancient people transported a wild relative of the common potato across the southwestern U.S., likely expanding the range of the species, according to a study published January 21, 2026 in the open-access journal PLOS One by Lisbeth Louderback from the University of Utah, U.S., and colleagues. This research provides new evidence that Indigenous people may have put the species on a path to domestication, while creating a unique cultural element in the Four Corners region.

A new medical large language model (LLM) achieved over 91 percent accuracy in identifying female participants diagnosed with major depressive disorder after analyzing a short WhatsApp audio recording where participants described their week, according to a study published January 21, 2026 in the open-access journal PLOS Mental Health by Victor H. O. Otani, from Santa Casa de São Paulo School of Medical Sciences and Infinity Doctors Inc., Brazil, and colleagues.