[Serious] Is the Past Real?

[polymath257]

If you should ever find yourself standing a few kilometers from ground zero of a thermonuclear hydrogen bomb, please note that you will be experiencing a past event that only lasted a millionth of a second.

You don't experience past events, you experience present events.  In the case of the bomb, you experience a flash of radiation and a blast of air.  These present events have a cause in the past, however.

I would disagree with that. The brain takes time to process the information from the senses. In fact, it can take fairly substantial fractions of a second to do so. So, the actual experience is always delayed from even the sensory event, let alone the event being sensed.

In the case of, say, a nuclear event at the site of an individual, it would be likely that no experience would be had at all since the vaporization of the body would happen much faster than the nerve signals and the brain processing. A nuke a kilometer away  would be a different matter, depending on the size and speed of the fireball.