‘Early dark energy’ fails to solve mystery of cosmic expansion
The extra ingredient would explain why the Universe is expanding so fast now — but conflicts with data from ancient quasars.
Huge California wildfires seeded cirrus clouds half a world away
Smoke from record-breaking fires in 2020 travelled all the way to Cyprus, where it helped to trigger cloud formation.
These falcons excel at problem-solving — and outdo some of the world’s smartest birds
A bird of prey called the striated caracara can figure out puzzles that are a struggle for Goffin’s cockatoos, which are known for their intelligence.
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