In Brief: Why oil prices tumbled below $0
b"COVID-19 lockdowns have taken a major swipe at the dominance of oil\\u2026as the worth of a barrel of U.S. oil tumbled to less than nothing. That's the first time in history that the price has turned negative. So, what does that mean exactly - and how did it happen?\\n\\nTo explain it all, we talk to CBC News national business correspondent, Peter Armstrong."