On this day in history April 23, 1971 – The Soyuz 10 was launched.
1981 – The Soviet Union conducted an underground nuclear test at their Semipaltinsk (Kazakhstan) test site.
1982 – The U.S. Bureau of Labor Statistics reported that consumer prices declined the previous month (March). It was the first decline in almost 17 years.
1985 – The Coca-Cola Company announced that it was changing its 99-year-old secret formula. New Coke was not successful, which resulted in the resumption of selling the original version.
1985 – The U.S. House rejected $14 million in aid to Nicaragua.
1988 – A U.S. federal law took effect that banned smoking on flights that were under two hours.
1988 – In Martinez, CA, a drain valve was left open at the Shell Marsh. More than 10,000 barrels of oil poured into the marsh adjoining Peyton Slough.
1988 – Kanellos Kanelopoulos set three world records for human-powered flight when he stayed in the air for 74 miles and four hours in his pedal-powered “Daedalus”.
1989 – Kareem Abdul-Jabbar played his last regular season game in the NBA.
1996 – An auction of the late Jacqueline Kennedy Onassis’ possessions began at Sotheby’s in New York City. The sale brought in #34.5 million.
1997 – An infertility doctor in California announced that a 63-year-old woman had given birth in late 1996. The child was from a donor egg. The woman is the oldest known woman to give birth.
1999 – In Washington, DC, the heads of state and government of the 19 NATO nations celebrated the organization’s 50th anniversary.