1. Languages are classified into families and trees, with over half of the world's population speaking just a few languages. The spread of dominant cultures and empires caused languages like Latin, Arabic, and Bantu to expand greatly. 2. Languages change over time with technology introducing new words and cultural interactions causing language mixing or new dialects. 3. Questions are raised about standard languages versus dialects and variants, and concerns about smaller languages being threatened by dominant ones like English. Place names also provide clues about past inhabitants.