Udyogi Whaa or Aha! Activities by Arvind Gupta is a children’s science book that is interesting to read and amazing to experiment and experience. Arvind Gupta is a famous inventor of India. He uses simple materials to make toys and teaches us science using funny simple instruments. He was awarded a Padma Shree in 2018 by the Indian government on the eve of the republic day of India. If you are interested in the book; you can check the book out by reading the book online on our website for free. You can also download the book’s PDF from our website for free.