Answer:
What instrument can you hear but never see?
It carries paper of the most important sort but also plastic, I'm glad to report. What is it?
In a year, there are 12 months. Seven months have 31 days. How many months have 28 days?
This small, round stone fruit that is typically bright or dark red, is often served on top of whipped cream on a milk shake.
Break it and it gets better, immediately set and harder to break again.
Before Google, we actually had to physically look things up in this building full of knowledge.