History is the only source which gives us an idea how we the humans can totally become alien to our own habits, culture, nature, diet. Ragi and Horsegram were evident in Assam and Meghalaya during Middle Paleolithic age. Evidence shows it. But now we look at both these as foreign cereals. Perfect grid system was used to build cities like Harappa, Mohenjodaro, Lothal, Kalibangan etc with straight roads intersecting in right angles. Oval sized Harappan cities were present in Haryana with Radial roads emanating from centre. Mesopotamian civilization was only one eighth the size of Indus valley civilization. But now in India, we can't plan a modern city. The expertise achieved 6/7 thousand years ago is lost. We need Le Corbusier to plan Chandigarh or Gandhinagar. When Gallileo was jailed for going against the orthodox church in Europe, Indian scientists already calculated circumference of the earth, found out that the earth was spherical, Sun is a star, 9 planets of the solar system. ...