Stephen George, from Australia, sent us by FedEx these sample vials, containing semiconductor nanocrystals in toluene solution:

CdSe/ZnS Core Shell nanocrystal quantum dots in toluene - not exactly 100% chemical free but the best we've had yet!

Mr George’s claim is based on the exciton confinement properties of such nanocrystals – they create a so-called  “quantum dot” where electrons are restricted in three dimensions.

The claim was that an “electron is not a chemical and that the solution/matrix is just a container.” Like other less well thought out claims we’ve heard, the necessity of the container rules this entry out from winning the prize. Mr George’s contention that a material’s properties are defined by its electrons only was also in dispute.

Having said all that, Mr George set about this challenge in a scientific manner, not regurgitating the same nonsense the advertising companies do, but methodically assessing the best candidate based on his own research. His entry is clearly streets ahead of claims of “100% chemical free organic olive oil” that I have received!

The following day I had an invoice from FedEx for the postage. In recognition of Mr George’s enthusiasm and creativity, although his entry is not eligible for the £1 million, I will reward him by paying the FedEx bill of £42.44. Not a bad second prize, but I won’t be giving out any more.

Thanks again to Stephen George for his creative entry.