Could Negative Mass or Energy Be Real and How Can We Find It?

[Zaius]

I would like to ask anyone if there is anything that could possibly contain negative mass or energy. If so how would you find it or were could it be. Also could you produce it or harness it after finding it.

Any info could be a great help.

 

[mohit_agrwal]

there can be -tive energy. depending on your referance.