I wish I was a millionaire. I could fulfil my wish of owning replica of IPK that is small cylinder of Platinum-Iridium weighting very very close to kilogram.
International Prototype Kilogram, the mass which used to be the reference standard for the kilogram until it was redefined to be based on fundamental constants a few years ago.
Before the standard was changed, I spent a while trying to get one of the prototype silicon sphere kilograms-- slightly misshapen would have been fine-- without success.
