QUOTE(eXOBeX @ Jan 16 2008, 01:43 AM)

Lego Technic taught me how a differential worked!

Ditto, the old red test car with the V4 engine!
I even went to austria on a school trip, found you could by packets of parts, bought 2 more diffs and converted mine to 4WD!
Still got the test car in a cupboard i think!