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  1. I am the weakest among my friends
  2. You can't live a single day without me on earth
  3. I put things together
  4. I won't let you go away from me. But you can
  5. You can't see me but you can feel
  6. Millions of years passed nobody knows who, why, how, exactly I am
  7. But I am what I am
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May be answer is

gravity

Explanation -

1. Gravity is the weakest force among all the forces
2. Gravity is the thing which pull things together
3. As there is a gravity on the earth we can’t live without it
4. As there two famous attempts to understand gravity (Newton,Einstein) but both couldn’t crack it ,yes Einstein did solve but failed to explain it in quantum level

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