Wellcome Collection, Euston Rd, London.

How would you like to carry all these volumes around with you?  Well, in a sense, you do already. This is the human genome written in small font. One of the fascinating items in this marvellous museum. Well worth a visit, but try not to breathe too deeply on your way there along the Euston Rd.
 
If you're not squeamish - the extras are of a shrunken head, a fragment of Jeremy Bentham's skin, and Napoleon's toothbrush.