Competition limits the ranges of mountain birds

A new study helps reveal why tropical mountain birds occupy such narrow elevation ranges, a mystery that has puzzled scientists for centuries. While many assumed temperature was responsible for these limited distributions, ...

Droughts in the sixth century paved the way for Islam

Extreme dry conditions contributed to the decline of the ancient South Arabian kingdom of Himyar. Researchers from the University of Basel have reported these findings in the journal Science. Combined with political unrest ...

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