As a statistician, i love this answer lol.
Under uniform distribution, one plus one equals two 12.5% of the time.
Scientific jokes. 1+1 = 2.
for the mathematician, this is a model and it is true if assumptions are satisfied.
For the physician, this has been always been observed, and it is true depending on the precision of the instruments.
For the informaticien, 1 +1 = 10
etc