draws the eye. He lost part of it in a duel and "wore a realistic replacement made of silver and gold". There may also have been a bit of copper in there, but one wonders just how realistic it was.

1007 GMT Prosthetics. an artificial item that replaces a missing body part. A heading on cognition leads to "executive function".

1010 GMT Executive function. The executive system is a theorised cognitive system in psychology that controls and manages cognitive processes, according to the authors of this entry. The rather curious sounding "Stroop task" is one of the tests used to measure it.

Image caption Tycho Brahe's nose may have had some copper in it

1012 GMT The Stroop effect is a demonstration of the reaction time of a task. Named after Johnrevolted by pearl earrings and fat people.

He loved his childhood cat, was friends with Mark Twain and said he was visited by a specific white pigeon every day towards the end of his life.

Oh and he was a proponent of eugenics.

Image caption Dream Caused by the Flight of a Bee Around a Pomegranate a Second Before Awakening is one of the longer article titles

1029 GMT Eugenics has a lengthy entry. Wikipedia's editors have furnished it with plenty in the way of proponents of eugenics. But what about opponents? English writer GK Chesterton is mentioned as an early enemy of the science of improving the human population.

1031 GMT GK Chesterton's entry includes a description of him as the "prince of paradox", a man who tried to find a third