How the mother of all 'short squeezes' helped drive stocks to historic gains Wednesday
1. Hedge funds closed short positions, causing a historic stock rally. 2. S&P 500 recorded its third biggest gain since WWII. 3. Short covering intensified due to fears from high China tariffs. 4. 30 billion shares traded, marking the heaviest volume day on record. 5. Market pullback observed as economic uncertainties loom over next months.