One of the things we did today while walking on the road.
Kids had a try on the weighing scale. No theory, no lecture, just learning by doing and observing what happens.
The more the child initiates her learning, the more she understands the power of choosing, of observing the world around, and the fact that she can try out what she sees around (of course, after assessing any danger) without necessarily being scared of who judges her and how.
Quite contrary to the busy parents who pull their curious kids away from such things(if at all, the child has noticed any on the road) by threatening that someone would come if she touches the thing there, natural self-led learning teaches so many things so quietly and inherently apart from what they learn by just trying out the thing(weighing scale, here)