What is F1 Halo, when it was introduced and how does it save lives?

The Halo prevents large objects and debris from entering the cockpit of a single-seat racing car, and is used in Formula One among other sports. After Zhou Guanyu said it saved his life, we explain why and when Halo was introduced, and how it works.

What is F1 Halo, when it was introduced and how does it save lives?

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