Testing Biscuit Joint Strength - Do Biscuits Add Strength To A Woodworking Glue Joint?

In this video I test the strength of various materials like melamine, plywood, MDF and solid wood with biscuits and without biscuits to see if biscuits add any strength.

I've heard people say that biscuits are purely for alignment, but others say that they add strength.

The results were very surprising to me!