As pressure on resources increases, pollution accumulates and humanity's impact on Earth escalates, global-scale governance of the environment is increasingly necessary. In June, the United Nations' Rio+20 Earth Summit in Rio de Janeiro, Brazil, will grapple with these difficult political issues. Up for discussion is a relatively new scientific concept: planetary boundaries.

Formulated in 2009 by Johan Rockström, director of the Stockholm Environment Institute, and his colleagues, the concept is based on the idea that humanity flourished under the conditions on Earth in the 10,000 years leading up to the industrial revolution — the Holocene epoch. So, to maintain human progress, we should keep the planet under similar biophysical conditions. The researchers set out nine key environmental measures and thresholds that should not be breached for fear of pushing Earth out of the Holocene-like 'safe operating space for humanity'. The boundaries include thresholds for climate change and bio

How walking through a doorway increases forgetting

A recent study provides intriguing information about the neural dynamics underlying behavioral changes associated with the development of new problem solving strategies. The research... supports the idea of "a-ha" moments in the brain that are associated with sudden insight.

Our daily lives are filled with changes that force us to abandon old behavioral strategies that are no longer advantageous and develop new, more appropriate responses. While it is clear that new rules are often deduced through trial-and-error learning, the neural dynamics that underlie the change from a familiar to a novel rule are not well understood.

"The ability of animals and humans to infer and apply new rules in order to maximize reward relies critically on the frontal lobes," explains one of the researchers who led the study, Dr. Jeremy K. Seamans from the Brain Research Centre at the University of British Columbia (UBC) and Vancouver Coastal Health Research Institute. "In our study, we examined how groups

Provided that, we can treat the things we encounter in urban environments as system resources, rather than a mute collection of disarticulated buildings, vehicles, sewers and sidewalks. One prospect that seems fairly straightforward is letting these resources report on their own status. Information about failures would propagate not merely to other objects on the network but reach you and me as well, in terms we can relate to, via the provisions we've made for issue-tracking.

And because our own human senses are still so much better at spotting emergent situations than their machinic counterparts, and will probably be for quite some time yet to come, there's no reason to leave this all up to automation. The interface would have to be thoughtfully and carefully designed to account for the inevitable bored teenagers, drunks, and randomly questing fingers of four-year-olds, but what I have in mind is something like, "Tap here to report a problem with this bus shelter."

In order for anyt