2. The Earth is billions of years old and a lot has happened in that time.

If you were to write a history of the Earth's past, allowing just one page per year, your book would be 4,600,000,000 pages long. That's a very thick book — 145 miles to be exact.

An average reader, reading about 1 page every 2 minutes would need more than 17,503 years to finish it. And that's with no time out for anything else — no time to eat, sleep, ride a bike, or go to school.

Even if you were an amazing speed reader and could read 2 pages every second, it would still take you nearly 73 years to read the entire book.

Let's try to make it a bit more manageable...