Misc: composer of the blue danube?

Questions

Nuclear accident at Three Mile Island near Middletown, PA?

Edwin Drake, drilled first productive oil well in US, born?

Niagara Falls stops flowing -- for 1 day -- because of an ice jam?

Coca-Cola is created (it had cocaine at the time)?

First Lt. William L. Calley, Jr. found guilty in the MyLai massacre?