Hand of whether the three digits of the bird hand involved the same homologous loss of two digits as in the dinosaur hand. The human hand normally has five digits: four fingers plus one thumb; these are often referred to collectively as five fingers, however, whereby the thumb is included as one of the fingers. It has 27 bones, not including the sesamoid bone, the number of which varies between people, 14 of which are the phalanges (proximal, intermediate and distal) of the fingers and thumb. The metacarpal bones connect the fingers and the carpal bones of the wrist. Each human
A Treatise of Human Nature our nearest and dearest cannot explain the universal and impartial nature of justice. Thus there is no motive capable of making justice count as a virtue, not until certain social conventions come into place. Hume closes this section by adding that we evaluate motives largely by comparison with what we consider to be normal human psychology, and that the rules of justice are so "obvious" and "necessary" an invention that they can still be deemed "natural" to the human species. Hume next devotes an important and lengthy section to two questions: First, how is the social convention of justice established?