Ms. BRYN AUSTIN (Harvard School of Public Health): What we found was that the fast-food restaurants were concentrated in areas within a very short walking distance from schools.

NPR: Kids Have Easy Access to Junk Food

Another characteristic, it added, was that mercury became more concentrated as it moved up the food chain, reaching its highest levels in predator fish that could be consumed by humans.

BBC: Nations agree on legally binding mercury rules

Another characteristic is that mercury becomes more concentrated as it moves up the food chain, reaching its highest levels in predator fish that may be consumed by humans, the report adds.

BBC: UN: Rising mercury emissions increase risk to humans

Without enough good healthy food, beekeeping is destined to become a concentrated feed lot enterprise.

CNN: What's killing the bees