Tim Urban

Tim Urban @waitbutwhy

When you look at a photo of yourself as a child, who do you see? The atoms that make up your body were scattered throughout the world when that picture was taken and the atoms in the kid in that photo have since moved on. So why is that child you? What is the definition of you? — PolitiTweet.org

Tim Urban @waitbutwhy

Supernovae are so rare that in our galaxy of hundreds of billions of stars, they happen about twice a century on average. This scales up to over 1,000 supernovae each second in the observable universe. Thousands have happened since you started reading this tweet. [Art: NASA] https://t.co/EGcTmDkirS — PolitiTweet.org