Uber Techy

he urge to hug a departed loved one again or prevent atrocities are among the compelling reasons that keep the notion of time travel alive in the minds of many.

While the idea makes for great fiction, some scientists now say traveling to the past is impossible.

Can You Time Travel?
The joys, terrors and true possibilities of navigating the fourth dimension, with quantum physicist Michio Kaku and astrophysicist Charles Liu.

How to Time Travel!
How can you swim upstream in the river of time? Liu and Kaku have some answers.

There are a handful of scenarios that theorists have suggested for how one might travel to the past, said Brian Greene, author of the bestseller, “The Elegant Universe” and a physicist at Columbia University.“And almost all of them, if you look at them closely, brush up right at the edge of physics as we understand it. Most of us think that almost all of them can be ruled out.”