HP's record-breaking Smile exhibition, in aid of the NCH children's charity, is on at the Royal College of Art for a limited time
Press release:
British Smiles Break Guinness World Record™
This year HP has been raising money for the NCH children's charity, pledging 25p for per picture featured in a special record-breaking photo exhibition with the simple, but effective theme: smile!
So far, over 35,000 photos have been accumulated, exceeding the tally required for consideration by the Guinness Book of Records as the photo exhibition with the most exhibits, which is apparently attributed to an exhibition of dentistry photos!

Each photo in the exhibition was sent to HP online and printed on an HP photo printer. About £10,000 has been raised to date.
The entire exhibition is on at the Royal College of Art until Monday, 29th August, next door to the Royal Albert Hall in Kensington and there is talk of taking it to other venues around the UK.

The official web site for the project is at www.hp.com/uk/smile and you can find more about the NCH children's charity at www.nch.org.uk.