Female zebra finches seek mate who sings one song just right

Humans aren't the only living beings who find a singing voice attractive in the opposite sex—songbirds do too. For about a third of the approximately 4,000 songbird species that sing only one song, the features that make ...

What inner speech is, and why philosophy is waking up to it

It is quite rare for philosophers to start investigating a new area, and a lot of the questions they explore have been around since ancient times. However, there is something they have only begun to look at closely in the ...

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