Have you ever wondered why a feather and a hammer fall at the same rate, despite their vast difference in weight? It’s one of the most puzzling phenomena of nature, and understanding it requires ...

All of the objects in our solar system are acted upon by forces. Forces are pushes or pulls. Every force has both a strength and a direction. Applying a force on something–like pushing a toy car–can ...

This EPJ C Topical Collection presents a series of reviews showcasing the latest developments and applications of gauge/gravity duality, and aims at dissemination to a wider physics community in a way ...

I didn’t have an apple tree to sit under to understand gravity, but living in a skiing and mining town surrounded with steep, sloped mountains introduced me to gravity forces, both positive and ...