Knowledge gained by combining measurements and simulations leads to increased confidence in the safety of products, as Louise Wright explains.

Having them lined up like this makes them easier to count. You've got four rows of meebs, with 3 meebs in each row. So all together that's 4 times 3, which equals 12. From where you're standing you ...

There are 1… 2… 3… 4… 5 in that cupboard. Looks like there’s 5 in that cupboard. I’d say there are 5 in that cupboard as well. How many is that altogether ...