Focused and Diffused Attention

You've talked about two kinds of attention: one like a wide, diffuse observation, and the other more focused. Can you say more about this?

Regarding your instruction to be aware of sensations and feeling tactile sensations, is there some particular kind of sensation I should be looking for?

How many different kinds of things should we be doing during meditation?

You mentioned at the beginning not to create expectations or put out any goals, how do I do that?

What do I do when my breath gets quiet I have a lot of difficulty having any sensation strong enough to keep my attention focused?

Sometimes I go above my body rather than being in my body, so I find it hard to stay in my body. What is that called, and is that the right thing 

Is Samadhi scientific?