Can you talk a bit about the tingling sensation from touching the aluminium case of a macbook pro, when using a non-earthed cable with the power supply? With the latest macbook pro M1s, apple no longer include an earthed cable in the box (with the exception of the three pronged adapter in the uk).
Since you know a lot about this; Does the human body really need 1G of gravity to avoid the bad effects of long term weightlessness? Would it be sufficient with say 0.5G or 0.25G? I assume it would reduce the radius and speed requirement of a rotating space station quite considerably.