On: American stocks are at their most expensive in decades

[NewJazz]

Sorry I signed an NDA with my time travel provider. Just wait six months, you'll figure it out.

[andsoitis → NewJazz]

You might have said this in jest, but I think it is a strong argument against the possibility of time travel into the past.

[datadrivenangel → andsoitis]

efficient market hypothesis. No time travel because all valuable information has already been sent back through time.