What’s the hardest thing to find in the whole universe?
No, it’s not your keys.
What is rarer than a shooting star?
Rarer than a diamond?
Rarer than any metal, any mineral, so rare that if you scan the entire earth, all six million billion billion kilos or 13,000,000,000,000,000,000,000,000 pounds of our planet, you would find only one ounce of it?
It’s the element astatine. Ever heard of it? Read more on NPR’s Krulwich Wonders.