Silly String
To see silly string in your dream implies that you are trying to divert attention away from a problem. You are covering up your true feelings.
Steamroller
To see a steamroller in your dream represents your determination. You are not letting anyone stand in the way of your goals.
Scientist
To dream that you are a scientist signifies experimentation, invention, or eccentricity. You need to think outside the box. Alternatively, the dream suggests that you need to look at some problem more objectively and rationally. Perhaps you need to detach yourself from a situation or relationship.