is an old one—so old that its terms were framed by the poets Byron and Keats in the 1810s, soon after the Marbles’ arrival in England. Keats’s 1817 visit to the British Museum, where the ...

It’s almost automatic—if you notice a smudge when you look in the mirror, you wipe it off. Seems simple, but only a few particularly clever species such as orangutans and dolphins share this ...