Internet vocab: What does 'ping' mean?

Where does the phrase 'smoking gun' come from?

What is a hedge fund? And what does it mean to hedge your bets?

What is the gold standard? And gold bugs?

What are the rules for texting in English?

What is graphene?

What is a curveball?

What is a Maven?

What is learner autonomy?

What is showrooming? Why do retailers hate it?

What is big data? How can it save lives?

What is a debt default? The debt ceiling?