Now, however, comes the main event: the humble 2 x 4 brick. Lego has moved on from bendy bioplastic to making a new prototype block that is fabricated from PET plastic from discarded bottles.

What the study revealed, apart from the fact that building an iPhone PIN brute-forcing robot out of LEGO bricks is probably a lot of fun, was that a total of 274 of the four-digit PIN codes were ...