Cruelty Of Man Poem by Unnikrishnan Sivasankara Menon

2) Thus, the cruelty of humans against their own kin's started some 200000 years ago. From our ancestors, we have inherited this cruelty. Our cultural progress has not polished us enough

When the human species homosapiens erectus surfaced on the face of earth, there were at least seven other species of humans, pre-existing. All of them were eliminated by homosapiens, the scientists say.