13.7 billion years ago
How can we know what happened in the first second of after the Big Bang?
About 380,000 years after the Big Bang
What was the universe like with only these elements?
About 200 million years after the Big Bang
Why were the first stars so huge?
200+ million years after the Big Bang
Why is star death crucial to human life?
Around 4.56 billion years ago
What makes Earth special?
About 3.8 billion years ago
How did Life begin?
About 3.5 billion years ago
Why was increasing oxygen in the atmosphere bad news for many organisms?
About 2 billion years ago
What makes eukaryotes so important?
About 600 million years ago
How did cells combine to form larger organisms?
About 540 million years ago
How do we know about the Cambrian Explosion?
About 535 million years ago
How do brains change behavior?
About 475 million years ago
Why was it so hard for life to leave the sea?
About 250 million years ago
What makes mammals different?
About 67 million years ago
How did the impact affect the history of our species?
About 7 million years ago
What evidence do we have for the earliest hominines?
About 200,000 years ago
What makes humans different?
What evidence do we have of collective learning
About 11,000 years ago
Where did agriculture appear and why?
About 5,000 years ago
What conditions support the development of cities?
500 years ago
What happened as ideas, people and goods began to be exchanged globally?
200 years ago
How have humans reshaped the globe?
2008
How can we make Big History available to every high school student in the world?
With big history taught at over 30 universities around the world, a growing number of topical resources have emerged on the subject that are available for general public.
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