Check out TheDadLab for amazing art & science experiments and fun educational activities - including lots you can do easily at home. Sergei Urban, dad of two boys has compiled some fantastic videos, which you can replicate using materials that everyone can find at home.
This one asks What shape is the strongest?
There is a HUGE selection on his YouTube channel, including Playlists titled Kids science experiments, Kids activities, Coolest kids toys you can easily make at home, How to teach numbers to kids, Simple kids crafts, and Art projects for kids.
He has also started posting daily challenges on Instagram.
You can access more of his content at the following: