Title: Adolescence.
Question: Do American teenagers spend more or less time on leisure activities than adolescents in other countries?

Title: Arnold Schwarzenegger.
Question: In what competition did Schwarzenegger have to lift over 500 pounds while balancing on foot rests?

Title: Capacitor.
Question: What happens to the current when an inductive circuit is opened?

Title: Solar energy.
Question:
Shuman patented his solar engine system in what year?