Is there a material for shoe soles that makes no or very little noise when walking on as many different surfaces as possible?

Is there a special material for shoe soles that makes little to no noise when walking on as many different surfaces as possible, such as asphalt, wood, broken glass, stones, sand, pebbles, pieces of metal, etc.? Is this even physically possible?

Old toys? Asbestos?

Hello, I know the question is a bit strange and probably unlikely that it is so, but still: What material is a toy car (made to look retro) made of? At first I thought it was asbestos because of the fibers, but the color definitely wasn't real! What are these things made of? Thank you

Is it possible to start a company after completing a Master's degree in materials science?

Is a Master's degree sufficient / Is it possible for a Master's graduate in materials science to start a company after completing the Master's degree in which they research and develop new materials, but otherwise primarily manufacture and sell certain materials? Or would you rather need a doctorate for that?

How easy/difficult is it to develop materials?

If you have studied materials science at bachelor's and master's level, and have continued your education both during your studies and afterwards in the field of materials science and outside of it, and have worked as a materials scientist for a few years, can you then develop new materials independently, i.e. are you then capable…