500! That’s the number of young permafrost researchers roaming the surface of the Earth and registered with the Permafrost Young Researchers Network on the 18th of March, 2008. 500 members who progressively enriched a network that started from nothing in November 2005. Back then, we were dreaming of a web-based mailing list devoted to permafrost were 40 or 50 young scientists and engineers could discuss permafrost issues and exchange the most recent news fon their research.