The perceived risk that these limitations pose to human subjects has precluded any large scale clinical trials to date.
Turnbull backed the idea of a plebiscite soon after taking power from Abbott in September, but key details of the process – including the date, the question posed to the public and whether or not the result will be binding – remain unclear.
Dan Slater's piece in The Atlantic's first issue of 2013, "A Million First Dates: How Online Dating is Threatening Monogamy," explores the phenomenon of online dating and the threat it poses to monogamy.
To date the drilling industry and regulators have considered the risk posed to workers and the public by radioactive waste to be minor.
Yet to date the increasing degradation of riparian vegetation is a major concern due to the inherent risk it poses to quality and quantity of drinkable water.
At the same time, drawing on practical experience, research can identify knowledge gaps that to date pose limits to successful employment creation policy.
Furthermore, the long genes described in the Dikarya fungi, whose the Abi cox1 gene is the most amazing representative to date, pose an appealing and still unresolved question about why and how some fungal species organize their mitochondrial genes in such an expensive manner.
