After telling the great lesson, I try to present the Laws of the Universe experiments daily. I only set up a few experiments on my shelves. For the rest, the child chooses a card, gathers the materials needed and carries out the experiment following the directions.
Experiments set up and ready to explore,
The blue drawers contain additional apparatus for other experiments.
I use Montessori R&D experiments for the younger children. A sample of their experiments can be found here. I printed each experiment and statement on an individual card. Unfortunately, I can not share them on here due to copyrights.
I used the experiments from Montessori for Everyone for my older children. They can be found here.