Title: Capacitor.
Question: What is it called when a changing electric field existing between the conductive plates of a capacitor physically moves them?

Title: Endangered Species Act.
Question: What is the time limit for designating a species critical habitat after the species has been added to the endangered list?

Title: Child labour.
Question: What year was hazardous working conditions limited to children in Brazil?

Title: Zinc.
Question:
Who is attributed as first documenting zinc?