0 the idea of travelling into the past or the future --
Of course, at the same time travel is becoming more readily available.
At that time travel by air or under the water was not thought to be even a reasonable proposition.
How can we at the same time travel two directly opposite roads?
In fact, another way of looking at support for time travel is that it simply extends the capabilities already available in spatial dimensions in spreadsheet languages to another dimension (time).
A spreadsheet programmer can begin debugging by using time travel to try to understand this behavior.
Relativistic future-directed time travel, as far as we know, is perfectly physically permissible.
One such caveat is the energy expenditure of relativistic future-directed time travel.
To find out if this edit fixed the bug, the programmer explores the now-redefined history via time travel.
