What is quantum gravity?

The two greatest theories of modern physics - quantum mechanics and general relativity - don't fit together. Various approaches to quantum gravity are being explored to bring about a reconciliation. My other YouTube channels: The Science Fiction Rock Experience ( the music show I produce):    / @sciencefictionrockexperience   Discover Maths (with Juan Medina):    / @discovermaths   Science World (with Emrah Polat):    / @scienceworld1   My website: https://www.daviddarling.info My other videos on particle physics Planck and the birth of quantum mechanics, 1    • Max Planck and the birth of quantum theory...   What on Earth is the Higgs boson?    • The Higgs boson   Beyond the Large Hadron Collider    • Beyond the Large Hadron Collider: What's n...   String theory part 1    • String theory part 1   String theory part 2    • String theory part 2   String theory part 3    • String theory part 3: M-theory and beyond   Strangelets    • Strangelets: Scary Physics part 1   The Standard Model    • The Standard Model   The Large Hadron Collider: Genesis Machine    • The Large Hadron Collider: Genesis Machine   What’s next at the Large Hadron Collider?    • Large Hadron Collider: What's Next?   Are we on the brink of new physics?    • Are We On the Brink of Physics Beyond the ...   Has a fifth force been found?    • Has a fifth force been found? Breaking new...   Breakthrough at the Large Hadron Collider?    • Breakthrough at the Large Hadron Collider   Tachyons    • Tachyons: hypothetical faster-tha-light pa...   Images: CERN, NASA, Fermilab Music: https://www.purple-planet.com