Punctual time travel depends on how fast the Earth spins
Adrien HebertWant to set your time machine to catch a solar eclipse with a group of curious Mesopotamians in the year 700 BCE? It's not as simple as you think. You need to adjust for the subtle slowing of Earth’s rotation over time and know the history of sea level change—and even those bits of knowledge might not be able to get you there on time....
I regard the brain as a computer which will stop working when its component fail. There is no heaven or afterlife for broken-down computers. That is a fairy story for people afraid of the dark