With 100 children of age 2 to 5 sampled at random, two weeks' natural observation is carried out by teachers and parents to assess children's pro-social behaviors along with their daily performance.

Muir's learning in observation throughout his life led him to devote his last years to preserving the natural environment.

Call-backs and running gags are advanced techniques the humor experts use to get laughs. They're a natural when you sharpen your observation skills.