Interesting video, although his conclusions from the test should be inconclusive for comparison of end grain glue joint versus side grain glue joints simply because he was unable to cause the side grain glue joint to fail.

Because the wood fails prematurely along the grain lines, the joint cannot be tested for comparison. The results should have been that glue joints are stronger than cross grain wood strength, but weaker than along the grain wood strength. But it was fun to watch.

It would be interesting to test under tension, so see if it is possible to test the joints without the wood failing in either direction and truly test glue joint strength.

Thanks for posting the link. :-)