Did you know that Harry Truman won two terms but he was grandfathered in and the Twenty-second Amendment still made him eligible to run for president for a third term in 1952?

Did you know that a grandfather clause is an exception that allows an old rule to continue to apply to some existing situations, while a new rule will apply to all future situations?

Did you know that when a person is  grandfather in they often compromise the law since the person has been acting in that capacity for 7 years, they retroactively gain their license in that profession.

Did you know that in 1949, standards were passed requiring certain fire-safety improvements in schools. However, older schools, such as the Our Lady of the Angels School, were not required to be retrofitted to meet the requirements, leading to the deadly Our Lady of the Angels school fire in which 92 students and 3 teachers died, making it the second deadliest school fire in history.

Did you know that in 1952, the United States ratified the Twenty-second Amendment to the United States Constitution, preventing presidents from running for a third term (or a second term, if they had served more than two years of another's term)? 

Did you know that Harry Truman won two terms but he was grandfathered in and the Twenty-second Amendment still made him eligible to run for president for a third term in 1952?  

In the 1980s, as states in America were increasing the permitted age of drinking to 21 years, many people who were of legal drinking agebefore the change were still permitted to purchase and drink alcoholic beverages. Similar conditions applied when New Jersey and certain counties in New York raised tobacco purchase ages from 18 to 19 years in the early 2000s.

Did you know that the Federal Assault Weapons Ban, certain firearms made before the ban's enactment were legal to own? 

Did you know that automatic weapons that were manufactured before the Firearm Owners Protection Act were grandfathered in and maybe legally sold to civilians?

Did you know that according to the Interstate Highway Act, private businesses are not allowed at rest areas along interstates? 

Did you know that private businesses that began operations before January 1, 1960, were grandfather in and allowed to continue operation indefinitely?

Did you know that Michigan law MI ST 287.1101-1123 forbade ownership or acquisition of large and dangerous exotic carnivores as pets?

Did you know that animals already owned as pets at the time of enactment were grandfathered in, and permitted to be kept?

Did you know that the FCC stated that, as of March 1, 2007, all televisions must be equipped with digital tuners?

Did you know that stores that had TV sets with analog tuners were grandfather in so that they could continue to sell analog-tuner TV sets?

Did you know that in 1967, the FCC prohibited companies from owning both a radio and a television station in the same marketing area?

Did you know that those who already owned before the ruling were permanently grandfathered?

Did you know that in 1984 Mississippi passed a law changing their official mode of capital punishment from the gas chamber to lethal injection?

Did you know that under the new law, anyone sentenced after July 1, 1984, was to be executed by lethal injection; those condemned before that date were “grandfathered” into the gas chamber?

 Did you know that in 1998, the Mississippi Legislature changed the execution law to allow all death row inmates to be executed by lethal injection?

Did you know that in 1965, the Canadian government under Prime Minister Lester B. Pearson passed legislation that required senators to retire when they reached the age of 75?

Did you know that senators who were appointed before the legislation was passed were exempted from the mandatory retirement rule?

Now if you didn't know, now you know...

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