What is 1997 - 1978?

As an AI language model, I can provide comprehensive information on the given years of 1997 and 1978.

1997:

• The year 1997 was a common year starting on Wednesday.
• Bill Clinton was serving as the President of the United States.
• The first Harry Potter book, "Harry Potter and the Philosopher's Stone," was published in the UK by J.K. Rowling.
• The film "Titanic" by James Cameron was released, becoming the highest-grossing film of all time until "Avatar" surpassed it in 2010.
• The first social media platform, Six Degrees, was launched.
• Hong Kong was handed back to China by Britain after 156 years of colonial rule.
• The funeral of Diana, Princess of Wales, was watched by over 2 billion people worldwide.
• The Kyoto Protocol, an international treaty aimed to reduce greenhouse gas emissions, was adopted by the United Nations.

1978:

• The year 1978 was a common year starting on Sunday.
• Jimmy Carter was serving as the President of the United States.
• "Grease" was released, becoming the highest-grossing film of the year.
• The first test-tube baby, Louise Brown, was born in England.
• John Paul II became the first non-Italian pope in over 450 years.
• The Camp David Accords were signed by Israel and Egypt, leading to a peace treaty between the two countries the following year.
• The Jonestown Massacre occurred in Guyana, where over 900 people died from mass suicide and murder under the leadership of Jim Jones.
• The first mobile phone network was launched in Japan.
• The first episode of "Dallas" was aired, becoming one of the most iconic American TV soap operas.