Science is humankind's best tool for gaining cognitive access to the real world. Only what can be measured empirically under repeatable conditions can be said to exist in a cognitively relevant way. This is the stepwise victory of science. However, the present moment cannot be quantified, nor measured repeatedly: there is no objectively repeatable way to verify the nature of "now". Therefore the present moment does not exist in a scientifically meaningful way. "Now" is scientifically, and therefore almost certainly, meaningless for human existence.