_‏ leaf _‏ leaf _‏ leaf _‏ leaf :
rewards cause people to lose interest in whatever they were rewarded for doing ( , __‏)
_  left _‏, _‏

_‏ flower

?

-19.5: balloons
____2015‏


yes
_‏
, , , , .
-----.. ... , , , , !
( _‏)

__‏ hug


tree
‏ -
‏ -
‏-
‏ -

heart
_‏ -
_‏
___‏
___‏
_‏
_‏ -

__‏ cool

_‏! flower
, __‏, , .

_‏?
. , , , , .
_‏ - "", .
_‏ - , , 2007-1995 ‏ ‏, -2010 ‏ ‏.
_‏ - , , .

treetreetree ____2015‏ - 19  – ! treetreetree

, . ( - ). :

__‏

___‏ . , .

:


:

-'_'‏ leaf _‏ leaf __‏ leaf :