In that case, take-down requests can be difficult as it is technically challenging to trace the author of a defamatory or false post on a review site.
While social benefits play an important role in designing environmental policies in China, the benefits associated with mercury control are not yet understood, mainly due to the scientific challenges to trace mercury's emissions-to-impacts path.
Yet by nature of the production process, palm oil derivatives are shipped over long distances, creating serious challenges to tracing their origin.
In fact, this broader challenge to psychophysical reductionism traces back to Fodor (1974).
Her husband came to her aid by challenging the onlookers to trace their ancestry to monkeys (nothing could be easier, as a matter of scientific fact), accusing judges in previous trials against creationism of "taking away the rights of Christians," and ending with a call to stand up for Jesus.
Integral, rapid condensation transients have historically been a challenge to reactor safety codes like TRACE, primarily due to the presence of multi-dimensional, multi-phase flow.
We trace the challenge to a requirement on constraint decomposition algorithms or decomposition recombination (DR) planners used by most variational constraint solvers, formalize the feature hierarchy incorporation problem for DR-planners, clarify its relationship to other problems, and provide an efficient algorithmic solution.
One of the challenges was the "inability to trace some infected animals identified at slaughter back to a herd" [ 5].
Alana Tow, 13, an eighth-grader at Pollard Middle School in Needham, Mass., enjoyed the challenge of programming the robot to trace the letters of her name.
