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In your article you refer to a standard concept of a person speeding “in a rocket traveling slightly less than the speed of light” and say that “motion at such enormous speeds drastically slows the clock for the traveler.” That reasoning, which is common, troubles me. If the traveler is traveling speedily with respect to […]
- Physics
Realistic Time Machine? New design could forgo exotic ingredient
A novel time machine concept may avoid a problem of earlier, less-practical proposals by requiring only normal matter and the vacuum known to exist in space.
- Earth
Pollution Ups Blood Pressure: Inhaled particles linked to transient effect
In a laboratory setting, volunteers breathing pollutants generated by sources such as vehicle engines experience slight but steady increases in blood pressure.
