The Deadliest Flu Season in History?
Season 5 Episode 40 | 7m 41s | Video has closed captioning.
The flu might feel like some minor illness that you don’t need to worry about much, but tens of thousands of people still die from it every year. And back in 1918, Flu killed up to 5% of the world’s population. Could a flu that bad happen again?
Problems Playing Video? | Closed Captioning