Chess will never be solved, here's why

Quantum mechanics is apparently used in a long list of practical sciences.
Relativity apparently used in more exotic applications.
Dirac apparently already merged them. In 1928.
And even pioneered the concept of antimatter.
With Anderson apparently confirming that four years later with experimental discovery of positrons.

I think it is fair to say that quantum mechanics has way more practical applications. There aren't many practical tasks where relativity is needed. Sure, there are some, but it's a matter of degree.

please someone help me i am losing to 700s please

You need to play better moves.

how

Try a different approach. Or approaches.
Want some ideas?
1) after your opponent moves ask yourself - 'why did he make that move?'
if you can't answer it for yourself quickly - don't worry.
if you get the reason wrong - don't worry. 
Enjoy playing.
Common mistakes:.
2) If you want to win (remembering its just a game) - then you're opponent's pieces and what they can do - matters just as much or more than what your pieces can do. 
The common mistake is to think that you're only 'responsible' for your own pieces - since you can't move his pieces.
But you can. You can move his pieces - right off the board! Among other things.
3) Always assume there are tactics in the position that you haven't seen yet.
Your tactics and his tactics. Try to find them. Before you move or before he moves.
If you can't find them - or you think you've looked enough - don't worry.
4) Learn how to use his clock time. See number 3. Also think - 'what are his most likely moves for his next move? Why? Try to be ready instead of surprised.
If you've done it well - you might be surprised by his Bad moves.
And if he's rated 700 - then Trust - he's going to make a lof of those.
-----------
there's that short list of four. Try it out. Just an idea. Not 'instructions'.
There's also 'donts'.
Don't worry about openings. That's the biggest pitfall probably.
Set your filters to play people that are 100 points lower or higher than you or in between -
but don't worry about your rating though.
Good luck and enjoy your Voyage through the wonderful game of chess - probably the most popular indoor game of the last 150 years.

Relativity and quantum mechanics are not unified. They convert to each other in limited sense (special situations on their respective extremes), but that requires magic coefficients to reconcile them.

General relativity is used throughout everyday life. we guide satellites snd spacecraft with it, synch our clocks with it, play chess on this website with it, navigate by gps with it. we'd use it much more if our space exploration programs were not so lame.

quantum mechanics is used just as much, but probably not more.

quantum mechanics used to be used more commonly than it is now. it was once in every living room, because cathode ray televisions operated on QM principles. Now we've gone to LCD flat panels, and QM based TVs clog landfills.

anyway, unification would require one system with no magic coefficients. m-theory is the closest to a leading contender at this point, but no one knows if branes/strings are fundamental. the true elements could be even smaller.