Ninanais ba talaga ni bugan na mamatay? Bakit?

What affected the second industrial revolution have on transportation

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.

What deadly disease cost many workers their lives before dr. william gorgas found a treatment?