C12R.1 Suppose that in 2031, you invent the first practical teleportation device. The only problem is that (since energy must be conserved), the device must do something with any gravitational potential energy changes involved when you teleport to a different altitude. Suppose your device either gives this energy to or takes it from the thermal energy of the teleported person. You need to warn people using the device not to exceed certain elevation changes. What would be wise safe limits, do you think? Base your answer on sound medical science and cite your source.