Title: USB.
Question: What does the USB specification limit?

Title: United States presidential election, 2004.
Question: Which time period came into the spotlight, during the fall of 2004?

Title: Beyonce.
Question: How much money did Beyonce contribute at the beginning of her Hurricane Katrina foundation?

Title: Railway electrification system.
Question:
What frequency was typically used on US Amtrak?