I think the continued existence of the time/thyme pun is the best evidence we have that time travel will never be invented.
P.S. Life tip:
1. Take the emblematic outfit of your given profession.
2. Affix a clock or image of a clock to that outfit.
3. You are now a Time (that profession).
1. Grab your apron.
2. Affix clock to apron.
3. You are now a TIME WAITER.