Наука у свакодневном животу

Why does salt dissolve in water?Why does ice float?Why do metals conduct electricity?Why do neon signs glow?Why is the sky blue?Why does a ball fall?Why does a pressure cooker cook faster?Why can't we predict when one nucleus will decay?How can we count atoms we cannot see?Why are atoms different sizes?Why do some reactions get hot?Why does the periodic table repeat patterns?