For #treetuesday, here's a picture I took during my recent trip to Cambridge (UK). My host, +Timothy Gowers, identified this tree as a horse chestnut. In the autumn, the horse chestnut sheds its distinctive large nut-like seeds, which are called conkers.

Just behind the tree is King's College, Cambridge, where the pioneering computer scientist Alan Turing was an undergraduate in the early 1930s.

Relevant links
The horse chestnut (Aesculus hippocastanum): http://en.wikipedia.org/wiki/Aesculus_hippocastanum

King's College, Cambridge: http://en.wikipedia.org/wiki/King's_College,_Cambridge

Alan Turing: http://en.wikipedia.org/wiki/Alan_Turing
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