How did each discovery of atomic theory influence the work of scientists after them?

(there are no options. i don't understand the atomic theory at all. i have a unit exam coming up, and i think i'm going to fail, and this question is on my study guide. ! )

Auniform brick of length 25 m is placed overthe edge of a horizontal surface with a maximum overhang of 12.5 m attained withouttipping. now two identical uniform bricks of length25 m are stacked over the edge of a horizontalsurface. what maximum overhang is possible forthe two bricks (without tipping)? answer in units of m.