The Permian extinction was one of the biggest catastrophes in the long history of the Earth. The biosphere of the planet has lost almost all marine animals and more than 70% of terrestrial representatives. Have scientists been able to understand the causes of extinction and assess its consequences? What theories have been put forward and can they be trusted?
“Spent” means “spent, spent money”. But there are, it turns out, professional costs. Far from always, these expenses are monetary and not as harmless as they seem, not always replenished. Let's figure out what it is, and whether they should be feared