Why are relativistic effects not apparent in everyday life

I think there is 3 reasons but just tell me what you can

1) We don't encounter high enough relative speeds for speed-related relativistic effects to become significant.

2) We don't experience strong enough gravity for gravitational relativistic effects to become significant.

I'd be interested in knowing what you think the three are.

Actually, they are. If you use a GPS system in your car, you're using a system that has to account for relativistic effects.

GPS uses a system of satellites where each satellite carries a highly accurate clock. The satellites move very fast relative to the earth and so their clocks run a little bit slower than an earthbound one. Every so often, they need recalibrating. Without this, the system would be unusable.

1. relativistic effects are not noticeable until the motion becomes an appreciable fraction of the speed of light, and

2. our everyday speeds are no where near the speed of light