Mapping Highways with Slime Mold

"Slime mould is surprisingly good at finding the most efficient route to food, despite being a single-celled organism with no brain or central nervous system. Adamatzky and colleagues used oat flakes to map out the major cities of Africa, Australia, Belgium, Brazil, Canada, China, Germany, Iberia, Italy, Malaysia, Mexico, the Netherlands, the UK and the US, then placed the slime mould at the capital city of each and allowed it to grow."

Read about it over at New Scientist - Slime mould spreads through world's motorways