Why downvote the comment above? It was factual and accurate. The temperatures in the cave 50 Celcius with a humidity of 90%. You can breath the air - for a while. You die of hyperthermia, not toxicity.
Rocks on the lake Baikal get heated from the sunlight every now and then and melt the ice beneath. After the sun is gone, the ice turns solid again thus creating a small stand for the rock above. It is called the Baikal Dzen.
Why downvote the comment above? It was factual and accurate. The temperatures in the cave 50 Celcius with a humidity of 90%. You can breath the air - for a while. You die of hyperthermia, not toxicity.
Likewise, #28, the big sunflowers are not uncommon; they're just not popular, so they're not cultivated often.
Cool article.