just to play along what a hollow earth would feel like to live in. Assuming that the centre is hollow, a round cavity, there would be no gravity there.
You could push yourself off the inner wall under England and float to Australia, envied by the kangaroos, but take a cushion along, the arrival would be as strong as your departure.
we know now that zero gravity has grave consequences on our bodies, including the brain. living inside a hollow earth would simulate that.
it was also skew our seismic findings, change the mass of the Earth, it's relationship to the moon, shift the barycenters.
Present a perspective with wrong priorities, like wt's performance record. .