Answer from cs61c-cj (Peter Lau 16539384) for Question 1
Anyone preparing a meal in a kitchen probably benefits from spatial locality.  In most houses, the kitchen contains cooking ingredients, pots, pans, and a refrigerator.  When preparing dinner, one can easily get to the seasoning sauces and then cook the food.  It would be very inefficient to have the refrigerator in the attic, the ingredients in the living room, and the cooking utensils in the bathroom.

A carpenter working on making a shelf will not put away his or her hammer and set of nails quickly because he or she will most likely use it again very soon.  Since some tools (like a hammer) are used so much, the carpenter would probably be carrying it around.