Ethiopia follows its own calendar, which is roughly 7 to 8 years behind the Gregorian calendar.

The world's deepest lake is Lake Baikal in Russia, containing 20% of the world's unfrozen fresh water.

The Amazon rainforest produces about 20% of the world's oxygen.

The first novel ever written is widely considered to be 'The Tale of Genji', written by a Japanese woman around 1000 CE.

The Year Without a Summer in 1816 followed a massive volcanic eruption in Indonesia.

The ocean contains structures larger than mountain ranges.

The Roman navy played a key role in Mediterranean dominance.

The lifetime odds of living to age 100 in developed countries are about 1 in 250.

Wealth inequality exists in nearly every country.