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Explore the most exciting new ideas and emerging concepts in science, health, technology and the environment with 91av’s exclusive in-depth articles, interviews and long reads.
Thick-billed murres normally mate for life, but young couples are more likely to break up, despite seeing no benefit to mating success the next year
No sightings of the Pernambuco holly tree had been confirmed since the species was first identified in 1838. Scientists have now found four of the trees in the city Igarassu in north-east Brazil