Porosity experiment. (Shaking may help a little bit.)

Permeability experiment. (Brono is in charge.)

Shall I shake more? (Note: it is not allowed!)

Permeability experiment.

Lots of math. (Not true.)

Push the can into gravels. (It is not easy at all.)

Free falling experiment?

Permeability experiment.

"Come on, it is too slow".

More math.