The cold fusion was a claim made involving a glass of water. It was assured that cold fusion occurred in water the rules of quantum mechanics proved that creating fusion without heat is impossible.

The most basic principle of time travel is to get a very dense object traveling really fast in a circle. It it is dense and fast enough then it can fold timespace into itself because of the gravitational field it would produce. If you could then move inside of this tube you could exit it at points that occurred at different times however it is only possible to enter or exit the tube at a time in which the loop existed. In other words you could only travel back to the first occurrence of this phonomonon.

Another technicality is that you can in theory travel faster and slower in time based on the amount of gravity present. This is why time stops near points of universal singularities. As the gravity becomes infinitely massive time slows down infinitely. When you fly in a plan time literally moves faster than when you are on the ground. The further away from a central force of gravity you are the faster time moves. So yes this does mean that by moving to Florida old people live longer b/c they are at see level and time moves slower than it does at higher altitudes. But than again we are talking about really really small numbers here so do not start looking for wrinkles every time you get off a plain.

lets keep the graphs going: