Learning is fun.

This is JUST A PART of the model construction kit which we bought over 40 years ago.
At Christmas whilst the boys got ever more Lego Mr. and Mrs. K got more extension kits.
It was used in schools and colleges and still is I believe.

There are lots of books to show how to use all the parts. You can learn about gears and pulleys, 
Electronics, hydraulics and light. You could build vehicles, bridges and cranes and several ways to control machines using the electric motors provided.

If I had the energy I would have built a working model.
But my energy is going into the final effort of Covid recovery.
The red test line is becoming very faint and I shall be disappointed if the test is not negative tomorrow.