Science & Mathematics

What is the scientific principle behind vaccines? How do they help our immune system fight diseases?...

How is the periodic table organized and what information does it provide about elements? Why are elements arranged this way?...

What causes gravity and how does it work? Why do objects with more mass have stronger gravitational pull?...

I'm studying geometry and need help understanding the Pythagorean theorem. What is it and how is it used in real life?...