The concept of time travel has become popular ever since H.G. Wells wrote the science fiction novel: "The Time Machine", way back in 1895. Wells coined the term "time machine" to describe a machine ...

Civil engineers can rightfully claim that no two bridges are exactly alike. However, bridges share many known characteristics, and the materials they are built with have known characteristics.

Life is full of contradictions, moments where two seemingly opposing truths exist side by side. The more we try to make sense of them, the more we realise that paradoxes are not meant to be solved; ...

Editor’s Note: Published in 1957, this article comes from Martin Gardner’s legendary Scientific American column Mathematical Games. Read more in our special digital issue, Fun and Games. A paradox is ...

Robert Pepperell does not work for, consult, own shares in or receive funding from any company or organization that would benefit from this article, and has disclosed no relevant affiliations beyond ...

Parallel realities, the Big Bang, a cat that's dead and alive at the same time -- physics is full of seemingly unsolvable paradoxes. Jim Al-Khalili, a quantum physicist, explores nine massive ...

The correct technical definition of infinity is that it is equal to some of its parts. For example, both the set of all real numbers and the set of all even numbers have infinite elements, yet it is ...