So yesterday my carer and I were discussing him getting a kindle. I have 2 working kindles and I suggested he get them both to look at the features / size / weight.
He was convinced they were identical so, to solve the issue he weighed them both.
I was right. One kindle is 3g lighter than the other.
So I seem to have a superpower of noticing when things are slightly lighter/heavier.
What power(s) do you have?