Mmmmmm. Sexy scientist chick.

Nice one Harrow!

so when I buy a kilo of bananas am I really getting a kilo or a grave of bananas?

I was wondering that and my first guess is that even though the material is not supposed to corrode, there is probably a small corrosion effect on the surface which would increase the mass. The variation in corrosion effects could be explained by different temperatures of storage.
It looked like all the variations were positive so that would be consistent.
Just a guess.

greenleader said..
so should we all buy a kilogram measure to test our places we buy stuff from to ratify! and where do we get one from?

I will be sure to do that when I measure the weight of the package you courier to me on Monday

Omg , I just realised when converted to pounds I got 220 to move around, maybe that's why I have a f@cked knee