Alkuaineet

Atomi - kertaus

Kertaa kemian materiaaleista, että mitäs ne atomit oikein olivatkaan? Atomi - muistiinpanot

Mistä me olemme peräisin?
- "Astrophysicist Dr. Neil DeGrasse Tyson was asked by a reader of TIME magazine, “What is the most astounding fact you can share with us about the Universe?” This is his answer."