On: Japan starts space elevator experiments

[Keyframe]

Of course we know. Bend space and don't travel faster than light. We JUST need exotic matter of sufficient energy density to carry around.

[adrianN → Keyframe]

Yeah and since nobody knows whether the exotic matter needed actually exists, we don't know whether bending spacetime in the required way is physically possible.

On the other hand, we can successfully freeze and thaw bunny kidneys.

[TeMPOraL → Keyframe]

And some way of resolving the resulting time travel paradoxes.