Can we travel in time?
There are people who claim there's evidence of timetravel but 'they' don't want us to know. Complications aside (going back in time and killing your own grandfather before he meets your grandmother so you won't be born and thus can't travel back in time to kill you own grandfather): do you think it will ever be possible to travel back in time?
The story about the ancient watch has been (sadly) debunked: http://metro.co.uk/2015/02/18/8-times-photoshop-has-fooled-the-world-be-honest-did-these-get-you-5068756/ In other words: do a bit of investigating (it took me less than a minute to perform the Google search!) before you reach a conclusion on anything.
We already know we can travel into the future.
My son already knew when he was just five years old:
'We all travel into the future at a speed of one second per second.'
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My author page: Terrence Weijnschenk at Amazon