The Opposable Thumb
Thumbs that can be placed opposite the fingers of the same hand
allow the digits to grasp and handle objects,
and are characteristic of primates.
"The opposable thumb has helped the human species develop more accurate fine motor skills.
It is also thought to have directly led to the development of tools,
not just in humans or their evolutionary ancestors,
but other primates as well.
The opposable thumb ensured that important human functions
such as writing were possible.
The thumb, in conjunction with the other fingers,
makes human hands,and those of other species with similar hands,
some of the most dexterous in the world."
We take it for granted until a sore joint suddenly calls attention
to the specifics of this miracle opposability (don't ask).
Take a minute to have a closer look at some amazing details