Sorry dude, you're barking up the wrong tree. HAHA. But really, the only live/wet part of a tree is just under the outer bark. As a tree gets old, it often splits exposing the inner/dry heartwood that is not alive and not moving water up into the upper parts of the tree. This becomes infested with beetles etc., and after time becomes soft and porous. This makes wonderful fuel for a fire. It also acts like a chimney containing the heat. I fought fires with the US Forest Service as a Smokejumper for a number of years. Most of my time was spent scraping out the burning inner heartwood just like the picture you are showed above. Sorry. NOT microwave. Look around you and you will see the same thing in lots of trees. Please STOP these crazy theories without doing a little homework. See below.
Sorry dude, you're barking up the wrong tree. HAHA. But really, the only live/wet part of a tree is just under the outer bark. As a tree gets old, it often splits exposing the inner/dry heartwood that is not alive and not moving water up into the upper parts of the tree. This becomes infested with beetles etc., and after time becomes soft and porous. This makes wonderful fuel for a fire. It also acts like a chimney containing the heat. I fought fires with the US Forest Service as a Smokejumper for a number of years. Most of my time was spent scraping out the burning inner heartwood just like the picture you are showed above. Sorry. NOT microwave. Look around you and you will see the same thing in lots of trees. Please STOP these crazy theories without doing a little homework. See below.
https://www.cnn.com/videos/us/2017/10/13/hollow-tree-fire-california-orig-trnd-lab.cnn https://www.usatoday.com/videos/news/weather/2019/10/22/large-tree-struck-lightning-texas-burns-inside-out/4063507002/ https://www.reddit.com/r/explainlikeimfive/comments/15fe8o9/eli5_trees_burning_from_inside/?rdt=61856