21 дек 1898 г. - Marie and Peirre Discovery
Описание:
On December 21st 1898 Marie and Peirre discovered radioactive compounds which became a new element. They measured the intensity around 3,000 times uranium.Добавлено на ленту времени:
Дата:
21 дек 1898 г.
Сейчас
~ 126 г назад