1. How did communication technologies like radio, television, and mobile phones change how people connected globally?

2. What role did social media play in events like the Arab Spring and police accountability?

3. How have transportation advancements like air travel and shipping containers affected the movement of people and goods?

1. What methods did scientists use to develop new crop varieties during the Green Revolution?

2. What problems did the Green Revolution create for small farmers and the environment?

3. What concerns arose from genetic engineering in agriculture?

1. How did the shift from coal to petroleum and natural gas affect industrial productivity in the 20th century?

2. What are the environmental and safety problems associated with fossil fuels and nuclear power?

3. Why have renewable energy sources like wind and solar power remained a small percentage of global energy output?

1. How did the discovery of penicillin change medical treatment, and what warning did Fleming issue about antibiotics?

2. How did the development of reliable birth control affect fertility rates and gender roles?

3. What diseases have been eliminated or greatly reduced through vaccination programs?