Problem: Tom and Bob grew up next to each other, but their houses were very different. Tom's childhood home was built in 1935 and had never been renovated since then, but Bob's home was built in 1994 and had been regularly updated to be more modern. They both enjoyed spending time at one another's houses because they seemed so different from their own home. Which child more likely was exposed to lead in their drinking water?

A: Tom

Problem: Nirvania continued to develop and became a first world country by 2025. Its economic strength and the accumulation of capital, led to prosperity and citizen happiness. On the other side of the river, Borania, however, decided to return to dictatorship and it's citizens and investors started to lose hope and move their capital to foreign accounts and investments. Which country has less confident citizens?

A: Borania

Problem: Keith is a doctor at the city hospital. Today, he is seeing six patients, patient A, patient B, patient C, patient D, patient E, and patient F. Patient A is a smoker, but patient B is not a smoker. Patient C uses sunscreen, but patient D does not use any sunscreen. Patient E tans with tanning lamps, but patient F tans in the sun. Would patient A have higher or lower risk of lung cancer than patient B?

A: higher

Problem: Two farmers tried different methods of growing their crops. Nate used pesticides, while his buddy Don used bacterium that produces a toxin instead. Don was happy with the results. Which farmer didn't use a bacterium that produces a protein that can act as an insecticide?

A:
Nate