Book 26, Question 72
What makes LEGO bricks fit together so well?
LEGO bricks have studs on top and tubes underneath that squeeze together tightly.
The bricks are made very precisely, within a tiny fraction of a millimeter. A Danish carpenter, Ole Kirk Christiansen, started making wooden toys in the 1930s and then changed to plastic. His company's stud-and-tube design from 1958 still fits with new bricks today.