A lot of Bioluminiscence, but Infrared light as almost in any living be, which we can’t see without special devices.

Structural weakness not only in the lower back, but also in the knees. The human being still has many reminists of an quadruped, as one of the younger species. He still has a way to be optimized as bipedo. Lower back and knees are still not optimized for this, apart of some other static and organic problems. We are still in phase beta.