Turner asked:


How can a person travel into the future of their original time line, what might be considered their “present”, given that once in the past, a divergent time line is necessary to preserve continuity? Seems that once a person travels back in time, it may be impossible to go back “home”.

RUBIN
Resist asked:


If Electromagnetic Radiation can travel through the vacuum of space then it can travel without a medium, but shouldn’t this be imposable? Or is it true that Electromagnetic Radiation uses the medium of existing magnetic fields, such as earths, distorting these fields much like sound waves do to air? And if so how can this have a direction of travel?

CESAR
Joop asked:


My Optics lecturer said something about how since light travels in a vacuum, you could, potentially, have something travel faster in a different medium, one other than a vacuum.

True or false?

ZACHERY