We recently saw research that suggested negative radiation pressure in light could lead to a practical tractor beam.

ENGADGET: Researchers build a working tractor beam, on a very small scale

Previous research by German scientists in 1999 suggested that short wave radiation had an "undefined negative" impact on homing pigeons.

BBC: NEWS | UK | Phone masts 'confusing' pigeons

But these new findings don't tell us whether activating the cells artificially, in this case by cell phone radiation, will have a negative effect on health.

CNN: Cell phone exposure increases brain cell activity