Although natural rubber is milky white, both road tires and racing slicks are black. All modern tires are black because of a key ingredient.

The diaphragm is really dome-shaped and flattens during inhalation, while in the model, a flat rubber sheet is pulled down The space between the lungs and wall of the thorax is very small but the ...

Space-time continuum is about gravity, not time travel "Einstein's theory of general relativity is our best theory of gravity. Think of a flat rubber sheet.

Now roll a marble (matter) around the rubber sheet (space-time) and the marble’s trajectory will change, being deflected by the warped sheet— this is space-time telling matter how to move.