A well-spent day brings happy
sleep.
Leonardo da Vinci

All our knowledge has its origins
in our perceptions.
Leonardo da Vinci

Although nature
commences with reason and ends in experience it is
necessary for
us to do the opposite, that is to commence with experience
and
from this to proceed to investigate the reason.
Leonardo da
Vinci

Anyone who conducts an argument by appealing to
authority is not using
his intelligence; he is just using his
memory.
Leonardo da Vinci

Art is never finished, only
abandoned.
Leonardo da Vinci

As a well-spent day brings
happy sleep, so a life well spent brings happy
death.

Arash, I am quite shocked by your reply http://imechanica.org/node/3045#comment-7151.  First you say "with all the due respect", then you say "trivial history".  But you prudently say "maybe I miss the point".  Maybe useful to clarify, also because probably iMechanica should start a discussion about history of mechanics starting a little earlier than this century. How can we judge Leonardo da Vinci? He has no published papers, no citation, no index, no Nobel prize... Not even a Timoshenko medal!  Maybe we should give him one post-mortem?    Please see the attachment.  Watch also the videos: