studiot

Relativity dear sir. Photons do not experience time, all their journeys are executed in zero photon time.

Chrome Fox 😀 Ever since their new parent I understand.

Well dang me! Why don't I get myself one of those little old smartphones that the world and his donkey can use on my behalf ?

If you use Hive home automation almost certainly not, if you use Alexa or a BBC smart speaker or similar almost certainly. But once again it depends upon what they do with the information. The above actually provide a useful (to some) and wanted service.

Even light itself is subject to the constraint I mentioned. Light travels along worldlines orthogonal to the time axis and is obstructed where ever its world line intersects that of a material object.

Thanks for replying, glad to see you back after the platform issues. Thanks also for the extra information. +1 A couple of points though. My original post was not about computers, but televisions, which should not be spying on anybody a la 1984. The second point is about what the collectors of this information do with it. The information about private life is neither good nor bad, unless someone is trying to hide illegal/unethical activity. I have never worried about Google, because I have always gained more from their services than it cost me in privacy. With Microsoft it is different. I have lost functionality with every new version of their products since XP, at an ever increasing rate. If they know what I want, why don't they offer what I want to buy ? Surely that is the first rule of business ?

I though I had already consigned mate selection to the sidelines of evolution. At any rate @Linkey has not replied to demonstrate a connection.

I think you miss my point and what you are describing is not quite the same situation as described in the OP. My point was that in order for a material object to move along a given singe dimension continuum the path in that single continuum dimension has to be clear (as in unobstructed by other material objects). Alternatively the object has the leave the defined universe (single continuum dimension) travel in some other universe and return to the original universe somewhere (somewhen) else.

Time travel as portrayed in any scfi situation I have ever come across is not possible in our universe. It is conceivable in the following way in a differently constructed universe. Imagine (or get MigL to imagine) that you are walking down a road and come across an obstruction, completely blocking the road - say a fallen tree, wall or landslip. Happily there is a side road just before the obstruction so you can turn down this side road until you come to the next road parallel to the obstructed one and continue your journey along that road. You could then turn down another connecting side road to return to your original road. Solid objects can't pass through each other, which is why the road is blocked. However you can side step because the situation I have described is 2 dimensional in space, even though an individual road is one dimensional. There is a second dimension in space for you to travel along. But our universe has only one time dimension so you are stuck with it, like you would be along the road if there was no side turning. Any form of loop requires 2 (or more) dimensions. There are two famous problems - riddles in topology that you may have heard of. The Koenigsberg bridges problem and the connection of 3 services to three houses problem, which can be solved in 3 dimensions but not 2 in order to avoid loops in space. There are also more complicated situations in 3 dimensional space that can be solved in 4 D to avoid loops. We call these knots. https://www.britannica.com/science/Konigsberg-bridge-problem https://en.wikipedia.org/wiki/Three_utilities_problem Edit Oh and don't believe what AL tells you as it is often wrong, although it can be useful if used with caution. Did you read the disclaimer that comes with all of them ? It is not gospel.

Evolution is about events of change. In which case Linkey needs to make a proper reasoned argument and explain what difference 'handicap' makes to evolution and why. Has it ever affected major evolutionary events such as the transition from sea to land, the development of eyes, ears etc ? Mate selection can only affect events in a very small way, if at all. And what about all those organisms that do not use sexual reproduction and mating. They are after all the majority of Life and always have been.

I'm sorry but this whole thread is the reason I find myself logging on and then just going away again more and more frequently.

That's because he thinks he is America.

Actually they dealt with this in the video too. Encrypted security certificates. They also pointed out that several companies now do this. But good question +1

Well I would be interested to see their solution to a hydraulic jump,or even the backwater curve behind an obstruction in the flow. Should be pretty easy for them as it involves an incompressible fluid.