A century ago, time travel was fiction


In physics, a time machine is known as a closed timelike curve (CTC). Basically, an object makes a loop through spacetime to interact with its past self. In a recent work published in Nature, a team simulated the possible effect of a time machine using polarized light. Since they couldn’t actually make a beam of light travel back in time, they used two separate beams of light, with one beam mirroring an earlier state of the other. Their focus was to study how quantum computers might be affected by a CTC.

Quantum computers use the fuzzy aspects of quantum mechanics to perform calculations. Rather than discrete bits of 0s and 1s, a quantum computer uses quantum states or q-bits. The challenges of quantum computing are huge, but they have the potential to perform some incredibly difficult computations with relative ease. In the early 1990s, David Deutsch demonstrated that if a CTC is self-consistent on a quantum level, then quantum computers could solve computational problems known as PSPACE-complete. In other words, it would be the supercomputer of all supercomputers.

From Professor Brian Koberlein, astrophysicist and physics professor at Rochester Institute of Technology.

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Four types of person known to the law

 Explanatory notes appear below the table.



In the law, evidence is what is capable of bringing a reasonable mind to accept the existence of the fact asserted. 

Persons -  that is,  recognized by laws generally, the basic figures featuring in laws, the actors of law.

Law - traditional usages or edicts which are norms modifying people's behaviors.

Individual - one human being.

Company - more than one human being, but not all of the neighborhood.

Official - the accepted identity of a person reposed with the purpose and power of the combination of all people of the neighborhood.

Divinity -  included because traditional usages and contemporary edicts around the world now and in the past proceed usually with some express reference to religious figures and teachings or God, the latter, after all, the progenitor of the Ten Commandments. 

It is not at all necessary to believe in God to accept the references in the table above. 

mtc