Like Pitru Paksha, on the Day of the Dead, people pray for their ancestors. In 2008, this tradition was inscribed in the Representative List of the Intangible Cultural Heritage of Humanity by UNESCO.
Herbert Spencer, the English philosopher-scientist, wrote in 'Principles of Sociology' that ancestor worship was the root of every religion.
Gai Jatra, the Nepalese festival that commemorates the death of the people during the year, was started by King Pratap Malla to show his grieving wife that she alone had not lost a son.
Evidence of the earliest form of ancestor worship was found in China in the Yangshao society, which existed in the Shaanxi Province area.
When Karna ( a warrior during the times of the Mahabharata) dies, his soul is served foods made of gold and silver. His hungry soul learns that this is due to his karma. While Karna was alive, he donated gold and silver but no food. His soul prays and returns to earth to donate food for a better afterlife.