Title: Bacteria.
Question: What was developed by Hans Christian Gram?

Title: Madonna (entertainer).
Question: When did Madonna appear in MTV for the tribute to Michael Jackson?

Title: Daylight saving time.
Question: Do those who favor DST say people would rather have an extra hour of daylight before or after their usual workday?

Title: Serbo-Croatian.
Question:
What were both Serbian and Croatian standards based off of?