time machine-> the time travellers convention a while back where mit tried to get people from the future to travel back in time and prove time travelling is possible, but no one came even though it is the most ingenious idea i have ever heard.
the time travellers convention a while back where mit tried to get people from the future to travel back in time and prove time travelling is possible, but no one came even though it is the most ingenious idea i have ever heard. --> Speed of light