Jaguar Travels 2,100 Kilometers Across the Amazon

China is changing its doctoral training rules so that PhD students in clinical medicine can earn their degrees without writing a traditional research thesis, according to Nature. The shift, with more degree programmes expected to follow, reflects a move to separate clinical training from research training and could reshape how China educates doctors and clinician-scientists. It matters because China trains a large share of the world's medical researchers, and any change to degree requirements can affect research output and the skills of future physicians.

An explainer examines how the largest cryptocurrency heist in history was carried out, focusing on the attack methods and security failures involved. The incident matters because it underscores the risks facing crypto platforms and could intensify scrutiny and regulation of the industry.

Fans are mourning the death of actor Sir Patrick Stewart, describing it as a big loss. The reaction highlights his wide cultural impact and the affection audiences held for him. Tributes from fans underscore his prominence as a performer.

Scientists report finding fossilised red blood cells preserved in a dinosaur bone dated to about 115 million years ago. The discovery suggests some cellular structures can survive fossilisation and may offer new insights into dinosaur physiology.

Researchers reported that electrically stimulating part of the brain can make people try harder on mental tasks, but the effect carries a downside. The finding matters because it could inform debates over cognitive enhancement and the risks of brain stimulation.