Based on information in The Evolution of Useful Things, what prompted the creation of waterproof sandpaper? salesman being embarrassed by faulty products
the need for a considerable amount of sanding
the poisoning of automobile industry employees
Richard Drew's work as a lab technician

our founding fathers introduced the revolutionary idea that each person's desire to pursue their idea of happiness was not self-indulgence, but a necessary driver of a prosperous society. they created a government to defend that right for everyone.

no, but sometimes i do.

i think the first one, it makes the most sense.

duncan's speech on his arrival at inverness is heavy with dramatic irony: not only is the "seat" (the surroundings) of the castle "pleasant," but even the air is sweeter than that to which the king is accustomed. the presence of the martlet (a summer bird) serves to heighten the irony. as far as the king is concerned, the castle, from the outside at least, appears to be a paradise. contrast this picture of delight with the imagery of hell that forms the substance of the porter scene (act ii, scene iii).