To stick with the above example: imagine the spaceship speeds up by firing its thrusters. Those onboard will stick to the ground just as if they were on Earth.

The most earth-friendly decision you can make is to stick with your old CRT until it bites the dust, but when it's time for a new one, is there a truly greener flat-screen TV?

The North Pole is the spot on Earth’s globe that marks the northern end of an imaginary stick Earth spins around.