music: Early Pop Rock: Ironically, "Our Day Will Come" was #1 when this song was #2.?

Questions

What did Alexander Graham Bell invent in 1881 to help doctors caring for Pres James Garfield agfter he was shot?

Which american blacksmith invented the steel plough in 1837?

What was stored in a Leyden Jar?

Between 1620 and 1624 Cornelius Drebbel built and tested the first what on the Thames?

Which sight defect is the opposite of hypermetropia?