Thomas Edison invented film that moved past light. What happened as a result?

A.
Sound was matched to film.

B.
Films became a social event.

C.
Filmed objects became visible.

D.
Things appeared to be moving.

What is one reason why so many corporations prefer to incorporate in the state of delaware?

At what age must a person begin receiving their roth 401(k) payments?

Using mr smith and his id, identify two potential internal validity threats that might affect the a—b design. tell me how that threat might impact conclusions in the a—b design. note #1: you cannot use maturation (since i already did that one for note #2: there are some mr smith id threats that won’t have much impact in a single case design.