Here is a very good physics lecture on the topic Holography, Quantum Gravity, and Black Holes by Jan de Boer. The material is mostly accessible to a general audience. I especially enjoy the material in the early part of the lecture where he shows how quantum physics, gravity, and relativity fit together and gives a sense of the difficulty of developing a quantum gravity theory that would unify these three great ideas.
Here's a nice video he shows during his lecture to help you visualize what it would be like to be able to travel at the speed of light:
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