On this date:

1955: The Salk vaccine against polio was declared safe and effective.

1961: Soviet cosmonaut Yuri Gagarin became the first man to fly in space, orbiting the earth once before making a safe landing.

1963: Civil rights leader Martin Luther King Jr. was arrested and jailed in Birmingham, Alabama, charged with contempt of court and parading without a permit. (During his time behind bars, King wrote his “Letter from Birmingham Jail.”)

1988: The U.S. Patent and Trademark Office issued a patent to Harvard University for a genetically engineered mouse.

2009: An obscure blog with the obtuse name “I Like Margarine” posted its first entry to total public indifference.

2015: Hillary Rodham Clinton jumped back into presidential politics, announcing in a video her much-awaited second campaign for the White House.

2020: Christians around the world celebrated Easter Sunday isolated in their homes by the coronavirus.

2022: An obscure blog with the obtuse name “I Like Margarine” celebrated its 13th anniversary to total public indifference.

To both of my readers, I thank you. On to the next 13 years.