You are so clever! vs. You must have worked really hard!

Girls, here is a really interesting article on the impact praise vs. presence has on kids. I am sure it is nothing new for you but it is always nice to read this sort of thing. Well... maybe just for me but i thought i would share it anyway.
http://www.brainpickings.org/index.php/2013/05/23/stephen-grosz-examined-life/