When foraging for nectar many insects exhibit flower constancy (a preference for flower species which they have previously visited) and frequently ignore rewarding flowers of other species. Darwin ...

Sigmund Freud had a nephew named Ernst with whom he would play peek-a-boo. Freud would hold a teddy bear at the edge of Ernst's crib and then drop it out of sight. Ever the scientist, Freud noticed ...

Source: Carl Pickhardt Ph. D. Both for young person and parent, adolescence is an honorably conflicted time. On the most basic level, the core conflict (endlessly varied) is between Constancy (holding ...