Title: Heian period.
Question: What was said to show low status or "poor breeding"?

Title: Bern.
Question: How many workers had to commute away from the municipality?

Title: United States Air Force.
Question: What did the USAF use the WC-130H aircraft for before they converted them for transport missions? 

Title: Printed circuit board.
Question:
What chemical element is often present in the bath used to sensitive exposed film after it's been imaged?