Twenty-one radioisotopes have been characterized, with the most stable being < sup > 44 </ sup > Ti with a half-life of 60 years, < sup > 45 </ sup > Ti with a half-life of 184. 8 minutes, < sup > 51 </ sup > Ti with a half-life of 5. 76 minutes, and < sup > 52 </ sup > Ti with a half-life of 1. 7 minutes.

Twenty-one years later, the Sac ( Sauk ), Meskwaki ( Fox ), and Iowa Native American nations ceded their tribal land to the U. S. government under two treaties in August 1824.

Twenty-one years later on October 21, 1993, the Trust was vested, and the Trustees began the process of winding up Koe Guan Kong Lun.

Twenty-one years later, Virginia Dare, born in 1587 on Roanoke Island in present-day North Carolina, was the first child born in the Thirteen Colonies to English parents.

Their argument was subsequently enfolded into Wood ’ s The Power of Maps … Twenty-one years later, Wood and Fels have put the map back together again ‘ by replacing the whole idea of the map as a representation with that of the map as a system of propositions .’” “ The map is not a picture ,” Wood and Fels insist in this new book, “ It is an argument … everything about a map, from top to bottom, is an argument .”

Twenty-one years later, in 1992, cigarette advertising in foreign magazines was banned in Singapore.

Twenty-one years later, Willie ( Buster Keaton Sr .) receives a letter informing him that his father's estate is now in his name.

Twenty-one years later, the Tegenpartij sketches once again became topical, because of their strong resemblance in parts to the rise of the right-wing political party Pim Fortuyn List.

Twenty-one aircraft carriers conducted 86 war cruises and operated 9, 178 total days on the line in the Gulf of Tonkin.

Twenty-one percent of all households were made up of individuals and 9. 30 percent had someone living alone who was 65 years of age or older.

Twenty-one fraternities make up the Interfraternity Council.

Jean-Baptiste Lindet, being a member of the Commission of Twenty-one, had an instrumental role in the execution of Louis XVI and drew up the accusation in the acte enonciatif.

Twenty-one are recorded as killed in action and one killed in battle, fourteen being killed during the attempt to blow up the Achziv Bridge during the Night of the bridges.

Twenty-one panels make up the 16 ’ × 5 ’ Jesse Tree window, based on the twelfth century Jesse Tree from Chartres Cathedral.

Twenty-one shots hit the vehicle ; one round entered through an unarmored portion of the vehicle frame and struck Colonel Rowe in the head, killing him instantly.

Twenty-one percent of all families and 44 percent of families with a female householder and no husband present had incomes below the poverty level.

Twenty-one percent of the municipalities in New Jersey, including the six most populous cities -- Newark, Jersey City, Camden, Trenton, Paterson and Elizabeth -- all govern under the provisions of the Faulkner Act.

Twenty-one modern states have a coastline on the Mediterranean Sea.

Twenty-one of the MiG-29s were sold to the United States in October 1997 to prevent their sale on the world market, and for research purposes.

Twenty-one comics and graphic artists collaborated on the new cards, including Zina Saunders, daughter of the original artist.

* June 30 – Twenty-one students were killed and more than a hundred were injured when an American North American F-100 Super SabreF-100 jet crashed into Miamori Elementary School on the island of Okinawa.

Twenty-one other members of Charlie Company also testified on Calley's defense corroborating the orders.

Twenty-one homilies on some of Knox's favourite saints, including St Cecilia, St Dominic, St Joan of Arc and St Ignatius of Loyola.

Twenty-one days after, on 8 March, the 15-years-old Queen Catherine died in childbirth.

Twenty-one teenagers from Safed on a class trip were murdered in the attack.

Twenty-one people, standing on the launch pad, died when one of the rocket's four first stage motors ignited accidentally.

* Twenty-one texts on dinosaur tracks from the coal mines of central Utah

Twenty-one ( 21 ) rallyists who were determined to paralyze traffic, died on the spot on the streets of Escalante when the militia of then-strongman Congressman Armando Gustilo, who was bent on dispersing the rally, fired their guns on rallyists.

Twenty-one powers and states attended a conference held on the question at Brussels in 1863, and on the 15th of July the treaty freeing the Scheldt was signed.

Twenty-one African countries have been identified as the highest spenders of gross domestic product on military globally compared with the amount directed toward education.

Twenty-one volunteers arrived to begin their assignments in Sichuan province, where the Peace Corps has operated on a pilot basis since 1993.

Twenty-one members of the party turned back, but Lederer pushed on with Jackzetavon, one of his five Iroquoian-speaking Susquehannock guides.

`` Twenty-one '', replied the sheik.

Twenty-one bodies are recovered.

* 1981 – Twenty-one association football spectators are trampled to death at Karaiskakis Stadium in Neo Faliro, Greece, after a football match between Olympiacos F. C.

He is best known for his book Twenty-one Days in India ( 1878 – 1879 ), a satire upon Anglo-Indian society and modes of thought.

Twenty-one Americans were killed.

Twenty-one years after, it will host the contest again, after Swedish singer Loreen's victory in at Eurovision Song Contest 2012, in Baku, Azerbaijan.

* 1986 – Twenty-one people are killed and forty-one are injured after a bomb explodes in an airliner ( Flight UL512 ) at Colombo airport in Sri Lanka.

Twenty-one people died and thousands were injured during the 19 days of protests.

The notorious Twenty-one Conditions are adopted.

* September 12 – The Battle of Saragarhi: Twenty-one Sikhs of the 36th Sikh of the Sikh Regiment of British India, defend an army post against 10, 000 Afghan and Orakzai tribesmen.

Twenty-one guns announced the event, a national holiday was called, gambling ceased, and free champagne flowed throughout the principality.

Twenty-one Douglas DC-4 airliners were converted into car ferries as the ATL-98 Carvair, a major task that included replacing the aircraft's original forward fuselage with an extended version incorporating the flight-deck above the cargo hold and a side-hinged nose door through which five cars could be loaded, one at a time, by means of a mobile, ground-based " scissor " lift.

In January 1915, having captured the German colony at Qingdao, Japan sent a secret ultimatum, known as the Twenty-one Demands, to Beijing.

Twenty-one dukes in two dynasties ruled the Archipelago, until 1566 ; Venetian rule continued in scattered islands of the Aegean until 1714.

Twenty-one children from the Alton area were drowned, and 49 were injured.

Twenty-one half-hour episodes were produced by Ruby-Spears Productions, an animation house formed by former Hanna-Barbera head writers Joe Ruby and Ken Spears, from October 1980 to September 1982, when the show went off the air.