check this out if you take your thumb
and your pinky finger and touch them
together and notice a raised band there
that's actually called the palmaris
longus and around 15 of people actually
do not have this muscle in either one or
both of their arms let's see i do have
it in that one as well and that's
because it's a vestigial muscle which
means that an ancestor to humans likely
used it to climb in trees or walk on
their forearms but modern humans don't
really have a use for it and so some
people just don't have it and to be a
vestigial muscle it's got to be
something that doesn't cause a
disadvantage or a consequence so people
who don't have this don't have a lower
grip strength than people who do in fact
it's often one of the first muscles they
remove when they're wanting to do
reconstructive surgery on another part
of the body and that's on evolution