Why Days Are Getting Longer

The video discusses how Earth's rotation is slowing, making days longer by 1.8 milliseconds per century. This is due to the moon's gravitational pull and other factors like post-Ice Age pole rebound. Historical records and modern technology help track these changes. Additionally, new research suggests smallpox may be only a few hundred years old, challenging previous beliefs about its history.

What are some factors that might be speeding up Earth's rotation despite the gravitational pull of the moon?

What new findings about smallpox were revealed in the recent study published in Current Biology?