{ tcb }: spacetime curvature
{ tcb }: parabolic flight
{ tcb }: equivalence principle
{ tcb }: centrifugal force
{ tcb }: gravitational wave
{ tcb }: binary pulsars
{ tcb }: dispersed matter
{ tcb }: atmospheric drag
{ tcb }: inverse-square law
{ tcb }: distribution of velocities
{ tcb }: the ultimate