All of physical reality is governed by just four fundamental forces, and physicists have spent a century trying to unite them ...

The Standard Model of Particle Physics accounts for four fundamental forces—strong, weak, electromagnetism, and gravity—but for decades, scientists have wondered if an elusive fifth force might be at ...

Could a new, fifth force of nature provide some answers to our biggest questions about dark matter and dark energy? We’re working on it. The Standard Model is, for all intents and purposes, the ...