How many atoms are there in me? starter.

I don't know what prompted it but a student asked me, 'How many atoms are there in me?' After a quick calculation based on her mass and the atoms all being carbon, the number was too big to visualise. Hence the subsequent question from the same student, 'So how big would that be if every atom was a one pence piece?' This is the result. Thanks Niamh, for the original question