History runs in circles. Everybody wants to be an hero, so they will refuse to see the danger or to understand that ecosystems don't grant a second try if you c

History runs in circles. Everybody wants to be an hero, so they will refuse to see the danger or to understand that ecosystems don't grant a second try if you change something and regret it later. Mao died in 1976. Sparrows still remain extinct in most of China.