Herbie believes that erikson is right in that we can move fluidly from one stage to another without really seeing an end to the stage. this means that herbie sees the stages as:
being about nature
discontinuous
being about nurture
continuous

Depression is lifelong, though you can get medication to with it. the difference between sadness and depression is that sadness lasts a little bit, depression last a long time and it goes on and off. people usually get depression through experiences they have been through, or genetics.

Stimulants speed up the central nervous system.

The alveoli are what give the lungs so much space, and if they are big, there is more gas exchange than if they are small.