3 ms·
https://en.wikipedia.org/wiki/Onium https://en.wikipedia.org/wiki/Onium (Positronium is often called the zeroeth element in pop sci)
by Manishearth 11y ago
https://en.wikipedia.org/wiki/Onium https://en.wikipedia.org/wiki/Onium
(Positronium is often called the zeroeth element in pop sci)