Most of us grew up learning that there are nine planets in our solar system. Back in 2006 that all changed, when Pluto was demoted from being labeled a proper planet to its new classification as a ...

Investopedia contributors come from a range of backgrounds, and over 25 years there have been thousands of expert writers and editors who have contributed. Daniel Alpert is a Senior Fellow in ...

What is life? It’s a seemingly simple question that leads to complex answers and heated philosophical and scientific arguments. Some focus on metabolism as the key to life, others on genetics, and ...