The other day, cycling in the rain down a long, quiet road, I noticed that the water made a 'line' that, when going in a straight direction, would be fully aligned with the centre of the wheel (see picture, Fig.A). Then I noticed that when I made small adjustments, little turns of the handle bar, the water line didn't follow the direction of the wheel - it stayed in its previous position, like a gyroscopic compass pointing to the true North.
I tried asking my more scientifically trained school friends of all for their input. All I got were recommendations to watch the road and comments about age finally getting to me. How disappointed Galileo would be...
