[adityaathalye]

> what kinds of new materials are they using in the falcon rockets, do you know?

I was thinking of materials innovation and new materials.

Without looking anything up, I would guess exotic alloys, ceramics, polymers, fuels and fuel mixes etc. at a chemical level, stress/failure modeling at a mechanical level, new manufacturing techniques that exploit properties of existing materials to achieve new capabilities, increased production efficiency for faster turnaround at better tolerances and integrity (because you figured out how to precision weld the thing in a new way) etc.

(edit: clarity)