Prehistoric time line, geologic time scale, photos, facts, maps, and more from National Geographic. Humans have walked the Earth for 190,000 years, a mere blip in Earth's 4.5-billion-year history.

May every American have the strength to discern disinformation, rally for truth, and take action to stop the spread of lies for the safety of everyone.

this day is marked as Earth Rotation Day because of the relevance. Science, astronomy lovers honour Leon Foucalt today. Interesting facts Did you know that Earth is spinning faster than it has in ...