mechanical parts

Years back- when I worked as a teacher in a kindergarten, I used to collect old machines- like alarm-clocks and radios- bring them to the kindergarten and the kids could take them apart.
Today I brought some old, non-functional parts from work home. I work in a factory that develops and produces water meters and those small mechanical parts are always fascinating for the kids.
Yotam and Helen spent almost one hour taking apart, checking, sorting, trying to fit together again those gears, wheels, magnets etc.