Sri Lanka's Education Minister Akila Viraj Kariyawasam speaks at the inauguration ceremony of the Big Bad Wolf Sale in Colombo, Sri Lanka, June 27, 2018. The Big Bad Wolf Sale, one of the world's largest book fairs, kicked off in Sri Lanka's capital Colombo on Wednesday with over 1.5 million books on sale. (Xinhua/Ajith Perera)

People read books at the Big Bad Wolf Sale in Colombo, Sri Lanka, June 27, 2018. The Big Bad Wolf Sale, one of the world's largest book fairs, kicked off in Sri Lanka's capital Colombo on Wednesday with over 1.5 million books on sale. (Xinhua/Ajith Perera)

People select books at the Big Bad Wolf Sale in Colombo, Sri Lanka, June 27, 2018. The Big Bad Wolf Sale, one of the world's largest book fairs, kicked off in Sri Lanka's capital Colombo on Wednesday with over 1.5 million books on sale. (Xinhua/Ajith Perera)