The first commercial use of purified neodymium was in glass coloration, starting with experiments by Leo Moser in November 1927.

Leo Moser ( son of Ludwig Moser, founder of the Moser Glassworks in what is now Karlovy Vary, Bohemia, in the Czech Republic, not to be confused with Leo Moser, a mathematician ) investigated the use of praseodymium in glass coloration in the late 1920s.

In 2009, Putnam / Philomel published Artist To Artist: 23 Major Illustrators Talk to Children about Their Art, with contributors including Mitsumasa Anno, Quentin Blake, Carle, Tomie dePaola, Leo Lionni, Barry Moser, Robert Sabuda, Maurice Sendak and Rosemary Wells.

A native of Vienna, Leo Moser immigrated with his parents to Canada at the age of three.

* Comprehensive list of 88 papers, lectures and other works authored by Leo Moser

* April 1961 photograph of Leo Moser

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In the late 1920s, Leo Moser ( Moser glass-works Director General, 1916 to 1932 ) recombined praseodymium and neodymium in a 1: 1 ratio to create his " Heliolite " glass (" Heliolit " in Čeština ), which has color-changing properties between amber, reddish, and green depending on the light source.

Leo Moser's papers in the Corning Glass Museum make it clear that the first experimental glass melts done by Moser involving any of the rare earths occurred in November 1927.

* Leo Moser, mathematician ( Moser polygon notation )

* Moser spindle, an undirected graph named after mathematicians Leo Moser and his brother William

In 1882 Pope Leo XIII had a Mass and an Office composed for his feast day, which he set at 14 April, the day after the day indicated as that of his death in the Martyrology of Florus ; but since this date quite often falls within the main Paschal celebrations, the feast was moved in 1968 to 1 June, the date on which he has been celebrated in the Byzantine Rite since at least the 9th century.

In April of the same year, Dr. Leo Alexander had submitted to the Counsel for War Crimes six points defining legitimate medical research.

# Leo XI ( 1 – 27 April 1605 ): reigned for 27 calendar days

Milligan was born in Ahmednagar, India, on 16 April 1918, the son of an Irish father, Captain Leo Alphonso Milligan, MSM, RA ( 1890 – 1969 ), who was serving in the British Indian Army.

On 7 April 2010, 3AW reported that Skyhooks were to appear on the first episode of the new series of Hey Hey It's Saturday with Leo Sayer on vocals.

A reunion telefilm, The Return of the Man from U. N. C. L. E., subtitled The Fifteen Years Later Affair, was broadcast on CBS in America on April 5, 1983, with Vaughn and McCallum reprising their roles, and Patrick Macnee replacing Leo G. Carroll as the head of U. N. C. L. E.

On April 20, 1884 Pope Leo XIII published an encyclical, Humanum Genus, that said that the human race was

* April 6 – Leo Aryeh Mayer, Israeli professor and scholar of Islamic art ( b. 1895 )

* April 25 – Leo Najo, American baseball player ( b. 1899 )

* April 1 – Pope Leo XI succeeds Pope Clement VIII as the 232nd pope.

* April 27 – Pope Leo XI ( b. 1535 )

* April 13 – Pope Victor II succeeds Pope Leo IX as the 153rd pope.

* April 19 – Pope Leo IX ( b. 1002 )

Pope Saint Leo IV was pope from 10 April 847 to 17 July 855.

Pope Leo XI ( 2 June 1535 – 27 April 1605 ), born Alessandro Ottaviano de ' Medici, was Pope from 1 April 1605 to 27 April of the same year.

On 1 April 1605, Alessandro ascended the papal throne with the name Leo XI after his uncle Pope Leo X, being then almost seventy years of age, but was taken ill immediately after his coronation and died within the month.

At the very time of Leo's accession Louis XII of France, in alliance with Venice, was making a determined effort to regain the duchy of Milan, and Leo, after fruitless endeavours to maintain peace, joined the league of Mechlin, on 5 April 1513, with the emperor Maximilian I, Ferdinand II of Aragon, and Henry VIII of England.

On 9 December 1513, the fifth Lateran council, which had been reopened by Leo in April, ratified the peace with Louis XII and officially registered the conclusion of the Pisan schism.

The same desire for peace and the death of Pope Leo ( April 19 ) were reasons why Hildebrand did not press for Berengar's going to Rome at once.

* April 12 – Emperor Leo I has his general Anthemius elected emperor of the Western Roman Empire.

In April 1914 Leo relocated to Settignano, Italy, near Florence, and the art collection was divided.

Pope Saint Leo IX ( 21 June 1002 – 19 April 1054 ), born Bruno of Egisheim-Dagsburg, was Pope from 12 February 1049 to his death.

* Leo Tolstoy in War and Peace ( Part 11, Chapter I ) discusses the race of Achilles and the tortoise when critiquing " historical science ".

da: Pave Leo 11.

Pope Leo X ( 11 December 1475 – 1 December 1521 ), born Giovanni di Lorenzo de ' Medici, was the Pope from 1513 to his death in 1521.

* December 11 – Pope Leo X ( d. 1521 )

During his absence on this mission, Pope Sixtus III died ( 11 August 440 ), and Leo was unanimously elected by the people to succeed him.

* May 11 – Leo VI, Byzantine Emperor

Leo survived the Battle of Versinikia in 813 by abandoning the battlefield, but nevertheless took advantage of this defeat to force the abdication of Michael I in his favor on 11 July 813.

* Novella Maioriani 4, De aedificiis pubblicis, " Public Buildings ", on the preservation of the monuments of Rome ( given in Ravenna, on July 11, 458, to Aemilianus, praefectus urbi of Rome, also in the name of Leo I );

* Novella Maioriani 11, De episcopali iudicio et ne quis invitus clericus ordinetur vel de ceteris negotiis, " Episcopal Courts ; No Person Shall Be Ordained A Cleric Against His Will ; Various Matters ", ( given in Arelate, on March 28, 460, to Ricimer, also in the name of Leo I );

* Ted Leo and the Pharmacists reference Philomel in their song " 2nd Ave, 11 AM ", from Hearts of Oak.

On October 11, 2000, while returning from a visit to relatives in the Dominican Republic, René was mis-identified as Leo Rosario at John F. Kennedy International Airport in New York and arrested.

In those 11 years, Martin and his panel of pals successfully ridiculed and made fun of these legendary stars in this order: Ronald Reagan, Hugh Hefner, Ed McMahon, William Conrad, Kirk Douglas, Bette Davis, Barry Goldwater, Johnny Carson, Wilt Chamberlain, Hubert Humphrey, Carroll O ' Connor, Monty Hall, Jack Klugman & Tony Randall, Zsa Zsa Gabor, Leo Durocher, Truman Capote, Don Rickles, Ralph Nader, Jack Benny, Redd Foxx, Bobby Riggs, George Washington, Dan Rowan & Dick Martin, Hank Aaron, Joe Namath, Bob Hope, Telly Savalas, Lucille Ball, Jackie Gleason, Sammy Davis Jr, Michael Landon, Evel Knievel, Valerie Harper, Muhammad Ali, Dean Martin, Dennis Weaver, Joe Garagiola, Danny Thomas, Angie Dickinson, Gabe Kaplan, Ted Knight, Peter Marshall, Dan Haggerty, Frank Sinatra, Jack Klugman, Jimmy Stewart, George Burns, Betty White, Suzanne Somers, Joan Collins, and Mr T. For nearly a decade, Martin had recorded as many as four albums a year for Reprise Records.

* October 11 – Leo Reisman, violinist and bandleader ( died 1961 )

Ninety-eight percent can be found in the following 11 clouds ( given in decreasing order of number of luminous galaxies ): Canes Venatici, Virgo Cluster, Virgo II ( southern extension ), Leo II, Virgo III, Crater ( NGC 3672 ), Leo I, Leo Minor ( NGC 2841 ), Draco ( NGC 5907 ), Antlia ( NGC 2997 ) and NGC 5643.

Finally, by order of Leo XIII, in his encyclical Annum Sacrum ( May 25, 1899 ), as well as on June 11, he consecrated every human to the Sacred Heart.

" Defender of the Faith " has been one of the subsidiary titles of the English and later British monarchs since it was granted on October 11, 1521, by Pope Leo X to King Henry VIII of England.

Leo VI, surnamed the Wise or the Philosopher (, Leōn VI ho Sophos, 19 September 866 – 11 May 912 ), was Byzantine Emperor from 886 to 912.

Leo VI died on May 11, 912.

Leo Kottke ( born September 11, 1945, Athens, Georgia, U. S .) is an acoustic guitarist.

Maximus next appears in a letter, dated June 11, 453, from Leo the Great, to whom he had appealed in defence of the prerogatives of his see.

Leo Calvin Rosten ( April 11, 1908-February 19, 1997 ) was born in Łódź, Russian Empire ( now Poland ) and died in New York City.

He has received many honors in his career, including honorary membership of the Order of Saint John ( Bailiwick of Brandenburg ), an honorary doctorate from Johns Hopkins University in 1993 and the creation of the Richard von Weizsäcker Professorship at the Paul H. Nitze School of Advanced International Studies ( SAIS ) of Johns Hopkins University and the Robert Bosch Foundation of Stuttgart in 2003, and more than 11 other honorary doctorates, ranging from the Weizmann Institute in Israel to Oxford, Cambridge and Harvard universities, the Charles University in Prague and the Indian Institute of Technology, Madras, the Leo Baeck Prize from the Central Council of Jews in Germany and the Buber-Rosenzweig Medallion from the Society for Christian-Jewish Cooperation.

The death of Leo VI on 11 May 912 and the accession of his infant son Constantine VII under the guidance of Leo's brother Alexander, who expelled Leo's wife Zoe from the palace, constituted a great opportunity for Simeon to attempt another campaign against Constantinople, the conquest of which remained the dream of his life.