Can anyone explain why Australia Post tracking numbers are so long (recently increased in length on the postal receipts).
They start with R and have 24 digits. That means that they are capable of recording 999 billion trillion parcels.
By way of comparison there are just 1 billion trillion estimated stars in the observable universe (1 followed by 21 zeros).
On the positive side, they wont ever need increase the number's length, as the Earth will have been well and truly swallowed up by the expanding sun long before they deliver that amount of parcels!
