Where Have We Come From?
Where Have We Come From? History of the species is written on the genes of its each individual. Genome is a palimpsest. Eons scribble on it – in a simple language comprising four alphabets and twenty odd, three-lettered words – as the organism evolves over geological ages. Life originated on earth nearly three thousand five hundred million years ago. Humans have been around for about 0.4 million years. Thus, a major portion of the book of our genome was written when we were not humans; if the book had one page for each million years, human story would occupy less than half a page in the three thousand five-hundred-page book. Modern humans originated in Africa. Story of our African parentage is indelibly etched in each cell of our body, numbering trillions. These etchings tell us a singularly fascinating tale of our ancestors as they travelled out of Africa and established home in the wider world. They were then, hunter-gatherers. Civilisations were born many...