Physics

What are nuclear fusion, fission, and radioactive decay?

What if friction disappeared? We all know we’ll slip, but things could go much worse.

What is hydrogen, the lightest element in the Universe? How it is essential to our body despite being flammable?

What if Earth was the centre of the Universe? The consequences are much worse than you have ever thought.

What is force? And how it affects our existence?

What if we lived on a super-Earth? What are the consequences and why we need to find an Earth-sized planet for our future?

What is light and how does it work? How to emit light and how photons come into existence?

What if all the planets crashed onto Earth? Will that be serious? Will the Solar System change much? And What if… other related questions?