Silly post, but I have always wondered about it. I have thumb joints that never ever bend. Both hands. Born that way. Could be worse. Doesn't matter. Just different. Oh well.....
This collage of twin grandsons at 3 1/2 months old needs a caption! They are very different in personalities!
please click on image to view larger
In Chinese philosophy, yin and yang is a concept of dualism in ancient Chinese philosophy, describing how seemingly opposite or contrary forces may actually be complementary, interconnected, and interdependent in the natural world, and how they may give rise to each other as they interrelate to one another.Wikipedia