What is the longest question in the world

Who was the first explorer to sail all the way down the mississippi river

The rise of advertising in the 1920s. i am good with seeing how advertisements shape the roaring twenties and how it developed a new way of life through modern days. but i am not sure what the details of advertising in the 1920s were. if possible can you send me links (preferrably credential links) to sources that maybe show like the first company to start advertising through the radio, how advertising benefits (statistics graphs), etc.

Acertificate of deposit usually pays you more interest because you need a larger amount of money to open it and a the money in a cd is the banks money not yours. b the money in a cd cannot be withdrawn until a future date. c the money in a cd is considered a loan. d the money in a cd is digital money.