Here are the answers to last year's quiz.

1. In 1921:

1. Which violence caused the daughter of the innkeeper and corset-salesman to suffer a revulsion of feeling? [Kronstadt Rebellion; Emma Goldman]
2. Which less-rapey adaptation of a novel secured the reputation of the former taxi-dancer? [The Sheik; Rudolph Valentino]
3. Where did an assortment of confectioners give away their wares, helped by Arab Death? [Cleveland Ohio; first Sweetest Day; Theda Bara]
4. Who created the first child star while making another first of his own? [Charlie Chaplin; The Kid]
5. Which future screwball appeared for the first time – uniquely, under her real name? [Carole Lombard as Jane Peters; The Perfect Crime]
6. What, in Britain, set the stage for 120 to become 4 (plus some scraps)? [Railways Act 1921]
7. What Southern territory lasted for a rather shorter time than its Northern neighbour? [Southern Ireland]
8. What 3-inch piece of paper was introduced, to be used for the next 93 years? [Car tax disc]
9. What activity was limited to only registered practitioners? [Dentistry; Dentists Act 1921]
10. How did a new charity cause people to remember what many of them wished to forget? [First sales of Remembrance Poppies for Armistice Day]

2. In 1971:

1. What officially opened in Egypt, to this day the largest of its type? [Aswan High Dam; largest embankment dam]
2. What first crossed the Atlantic, while its competitor was being cancelled? [Concorde]
3. Which former boxing champion, rugby forward, and fan of The Missioners started his caretaker régime? [Idi Amin; Hayes F. C.]
4. What rodent-related television programme was first aired? [Die Sendung mit der Maus]
5. Who took a flight from Seattle to Mexico City, but left early? [Dan ("D. B.") Cooper]
6. What pestilence reached Australia in spite of legislators' best efforts? [McDonald's]
7. What natural blonde was found to have been artifially enhanced? [Deepdene diamond]
8. Where did a new hippie squatter community (that survives to this day) quickly become the place to get cannabis in the capital city? [Christiania, København]
9. Where was the sailor the first to (almost) make landfall? [Mars orbit; Mariner 9]
10. Where did a future bat ecology expert uniquely survive that falling feeling? [Over Peru near Pucallpa; LANSA Flight 508; Juliana Koepcke]

3. [Murderers]

1. Where was the man who shouldn't have slaked his lime caught? [SS Montrose in the Lawrence River; Hawley Harvey Crippen]
2. What place turned out, during construction, to have a site both more appropriate for its purpose and more embarrassing than had been supposed? [New Scotland Yard, Victoria Embankment]
3. Where did someone have to die to allow two friends to stay together and continue to enter the Fourth World? [Christchurch, New Zealand; Parker-Hulme murder case]
4. What piece of software lost much of its credibility after the Russian doctor's body was found? [ReiserFS; Hans Reiser]
5. Who was caught on the basis of experiments with lady divers? [George Joseph Smith, "brides in the bath"]
6. Where did the journalist die of carbon monoxide poisoning, or stabbing? [in the Nautilus 3 submarine off København; Kim Wall; killed by Peter Madsen]
7. Where was a man convicted of murder for lending his car to a friend? [Pensacola FL; Ryan Holle]
8. When was the term "serial killer" first used? [1971, by FBI Special Agent Robert Ressler]
9. What first did the tailor commit on the banker in 1864? [First murder on a British train; Franz Müller against Thomas Briggs]
10. Which murder inspired several novels, including one co-written by the co-creator of Lady Sara, one by the former postulant from Sussex who lived in Devon, and perhaps (though nobody can be sure) Finnegan's Wake? [Edith Thompson and Frederick Bywater; The Documents in the Case, Messalina of the Suburbs]

4. In 2021:

1. Which US state was the 23rd to abolish capital punishment? [Virginia, March 2021]
2. Which gastronomic pioneer of the urchin was no longer available for comment? [Albert Roux]
3. Who ran from Belarus, to Japan, to Poland? [Krystsina Tsimanouskaya, Olympic sprinter]
4. What happened for the first time in Mecca? [Women were allowed to take part in the hajj without a male guardian, as long as they were in a "trustworthy group"]
5. What new sporting competition was announced before the broadcast rights had been sold, and folded after three days? [European Super League]
6. What legacy of Thomas Midgley was announced as having been phased out throughout the world? [Leaded petrol]
7. Which forty-year-old divine spear ended its flight 850m down? [KRI Nanggala (402), submarine of the Indonesian Navy]
8. Where did Bitcoin become "legal tender" (and promptly fail to work, of course)? [El Salvador]
9. Who was captured after ten years of searching, more than a hundred warrants, and millions of dollars of offered rewards? [Dario Antonio Úsuga David, leader of the Gulf Clan]
10. Who won by telling people to shut up and behave? [Måneskin, in the Eurovision Song Contest; Zitti e buoni]