What would happen if a time traveler killed her own grandfather? A physics undergraduate student may have come up with a way to avoid such a time-traveling paradox.

A scientist has mathematically proven the physical feasibility of paradox-free time travel. But once you go back, you might not like what you find.

The new math suggests that time travelers can do what they want, and paradoxes are not possible. Costa says that events will always adjust themselves to avoid any inconsistency.

Russell's Paradox and its resolution in modern axiomatic set theory show how our understanding of mathematics evolves and is refined over time.