What did martin luther describe as a mighty fortress and a bulwark that never fails?

When was wheeled traffic permitted in early rome? daytime nighttime all day never

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.

Historians sometimes rely on video recordings in researching past events because