![Markus TRUNK | Research Assistant | Technische Universität München, München | TUM | Faculty of Physics | Research profile Markus TRUNK | Research Assistant | Technische Universität München, München | TUM | Faculty of Physics | Research profile](https://c5.rgstatic.net/m/437738464651637/images/template/default/profile/profile_default_l.jpg)
Markus TRUNK | Research Assistant | Technische Universität München, München | TUM | Faculty of Physics | Research profile
![Swiss farmer and charcoal maker Markus Wicki arranges a pile of tree trunks which will be used to make charcoal, near the remote village of Romoos, central Switzerland in this June 12, Swiss farmer and charcoal maker Markus Wicki arranges a pile of tree trunks which will be used to make charcoal, near the remote village of Romoos, central Switzerland in this June 12,](https://c8.alamy.com/compfr/2e6rc40/swiss-farmer-and-charcoal-maker-markus-wicki-arranges-a-pile-of-tree-trunks-which-will-be-used-to-make-charcoal-near-the-remote-village-of-romoos-central-switzerland-in-this-june-12-2008-file-photo-the-wickis-are-one-of-few-mountain-farming-families-in-the-region-of-the-napf-mountains-who-have-carried-on-the-generations-old-tradition-of-natural-charcoal-making-using-a-slow-burning-pile-procedure-the-pile-once-it-is-lit-needs-to-be-constantly-checked-every-three-hours-during-the-process-which-takes-up-to-three-weeks-the-charcoal-is-only-produced-from-spring-to-autumn-and-can-fetch-up-t-2e6rc40.jpg)
Swiss farmer and charcoal maker Markus Wicki arranges a pile of tree trunks which will be used to make charcoal, near the remote village of Romoos, central Switzerland in this June 12,
![White-backed Woodpecker Male On Tree Trunk, Finland Photograph by Markus Varesvuo / Naturepl.com - Fine Art America White-backed Woodpecker Male On Tree Trunk, Finland Photograph by Markus Varesvuo / Naturepl.com - Fine Art America](https://images.fineartamerica.com/images/artworkimages/mediumlarge/2/white-backed-woodpecker-male-on-tree-trunk-finland-markus-varesvuo--natureplcom.jpg)