The huge amounts of undetected and exotic dark matter and dark energy needed to make general relativity work on large scales argue that we should investigate modifications of gravity.The only stable, metric-based Takeout Containers and invariant alternative to general relativity is f(R) models.These models can explain primordial inflation, but they cannot dispense with either dark matter or dark energy.I advocate nonlocal modifications of gravity, not as new fundamental theories but rather as the gravitational vacuum polarization engendered by infrared quanta produced during primordial inflation.
I also discuss some of the many objections which have Board Game Childrens Games Gently Used Games been raised to this idea.