April 21 : Do it again and again. Consistency makes the rain drops to create holes in the rock. Whatever is difficult can be done easily with regular attendance, attention and action.

On This Day, 21 April...

753 BC – Romulus founds Rome (traditional date).

43 BC – Battle of Mutina: Mark Antony is again defeated in battle by Aulus Hirtius, who is killed. Antony fails to capture Mutina and Decimus Brutus is murdered shortly after.

900 – The Laguna Copperplate Inscription (the earliest known written document found in what is now the Philippines): the Commander-in-Chief of the Kingdom of Tondo, as represented by the Honourable Jayadewa, Lord Minister of Pailah, pardons from all debt the Honourable Namwaran and his relations.

1092 – The Diocese of Pisa is elevated to the rank of a metropolitan archdiocese by Pope Urban II

1506 – The three-day Lisbon Massacre comes to an end with the slaughter of over 1,900 suspected Jews by Portuguese Catholics.

1509 – Henry VIII ascends the throne of England on the death of his father, Henry VII.

1526 – The last ruler of the Lodi dynasty, Ibrahim Lodi is defeated and killed by Babur in the First Battle of Panipat.

1615 – The Wignacourt Aqueduct is inaugurated in Malta.

1782 – The city of Rattanakosin, now known internationally as Bangkok, is founded on the eastern bank of the Chao Phraya River by King Buddha Yodfa Chulaloke.

1792 – Tiradentes, a revolutionary leading a movement for Brazil's independence, is hanged, drawn and quartered.

1802 – Twelve thousand Wahhabis under Abdul-Aziz bin Muhammad, the invaded city of Karbala, killed over three thousand inhabitants and sacked the city.

1806 – Action of 21 April 1806: A French frigate escapes British forces off the coast of South Africa.

1809 – Two Austrian army corps are driven from Landshut by a First French Empire army led by Napoleon as two French corps to the north hold off the main Austrian army on the first day of the Battle of Eckmühl.

1821 – Benderli Ali Pasha arrives in Constantinople as the new Grand Vizier of the Ottoman Empire; he remains in power for only nine days before being sent into exile.

1836 – Texas Revolution: The Battle of San Jacinto: Republic of Texas forces under Sam Houston defeat troops under Mexican General Antonio López de Santa Anna.

1856 – Australian labor movement: Stonemasons and building workers on building sites around Melbourne march from the University of Melbourne to Parliament House to achieve an eight-hour day.

1894 – Norway formally adopts the Krag–Jørgensen bolt-action rifle as the main arm of its armed forces, a weapon that would remain in service for almost 50 years.

1898 – Spanish–American War: The United States Navy begins a blockade of Cuban ports. When the U.S. Congress issued a declaration of war on April 25, it declared that a state of war had existed from this date.

1914 – Ypiranga incident: A German arms shipment to Mexico is intercepted by the U.S. Navy near Veracruz.

1918 – World War I: German fighter ace Manfred von Richthofen, better known as "The Red Baron", is shot down and killed over Vaux-sur-Somme in France.

1926 – Al-Baqi cemetery, a former site of the mausoleum of four Shi'a Imams, is leveled to the ground by Wahhabis.

1934 – The "Surgeon's Photograph", the most famous photo allegedly showing the Loch Ness Monster, is published in the Daily Mail (in 1999, it is revealed to be a hoax).

1945 – World War II: Soviet forces south of Berlin at Zossen attack the German High Command headquarters.

1948 – United Nations Security Council Resolution 47 relating to Kashmir conflict is adopted.

1952 – Secretary's Day (now Administrative Professionals' Day) is first celebrated.

1960 – Brasília, Brazil's capital, is officially inaugurated. At 09:30, the Three Powers of the Republic are simultaneously transferred from the old capital, Rio de Janeiro.

1962 – The Seattle World's Fair (Century 21 Exposition) opens. It is the first World's Fair in the United States since World War II.

1963 – The first election of the Universal House of Justice is held, marking its establishment as the supreme governing institution of the Bahá'í Faith.

1964 – A Transit-5bn satellite fails to reach orbit after launch; as it re-enters the atmosphere, 2.1 pounds (0.95 kg) of radioactive plutonium in its SNAP RTG power source is widely dispersed.

1965 – The 1964–1965 New York World's Fair opens for its second and final season.

1966 – Rastafari movement: Haile Selassie of Ethiopia visits Jamaica, an event now celebrated as Grounation Day.

1967 – Greek military junta of 1967–74: A few days before the general election in Greece, Colonel George Papadopoulos leads a coup d'état, establishing a military regime that lasts for seven years.

1975 – Vietnam War: President of South Vietnam Nguyễn Văn Thiệu flees Saigon, as Xuân Lộc, the last South Vietnamese outpost blocking a direct North Vietnamese assault on Saigon, falls.

1977 – Annie opens on Broadway.

1982 – Baseball: Rollie Fingers of the Milwaukee Brewers becomes the first pitcher to record 300 saves.

1985 – The compound of the militant group The Covenant, The Sword, and the Arm of the Lord surrenders to federal authorities in Arkansas after a two-day government siege.

1987 – The Tamil Tigers are blamed for a car bomb that detonates in the Sri Lankan capital city of Colombo, killing 106 people.

1989 – Tiananmen Square protests of 1989: In Beijing, around 100,000 students gather in Tiananmen Square to commemorate Chinese reform leader Hu Yaobang.

1993 – The Supreme Court in La Paz, Bolivia, sentences former dictator Luis García Meza to 30 years in jail without parole for murder, theft, fraud and violating the constitution.

2004 – Five suicide car bombers target police stations in and around Basra, killing 74 people and wounding 160.

2010 – The controversial Kharkiv Pact (Russian Ukrainian Naval Base for Gas Treaty) is signed in Kharkiv, Ukraine, by Ukrainian President Viktor Yanukovych and Russian President Dmitry Medvedev; it was unilaterally terminated by Russia on March 31, 2014.

2012 – Two trains are involved in a head-on collision near Sloterdijk, Amsterdam, in the Netherlands, injuring 116 people.

2012 – United Nations Security Council Resolution 2043 relating to Syrian uprising is adopted.

2014 – The American city of Flint, Michigan switches its water source to the Flint River, beginning the ongoing Flint water crisis which has caused lead poisoning in up to 12,000 people, and 15 deaths from Legionnaires disease, ultimately leading to criminal indictments against 15 people, five of whom have been charged with involuntary manslaughter.

Born

1945 – Srinivasaraghavan Venkataraghavan, Indian cricketer and umpire

1950 – Shivaji Satam, Indian actor

RIP

1900 – Vikramatji Khimojiraj, Indian ruler.

1938 – Muhammad Iqbal, Indian-Pakistani philosopher and poet.

2006 – T. K. Ramakrishnan, Indian politician.

2013 – Shakuntala Devi, Indian mathematician and astrologer.

2015 – Janaki Ballabh Patnaik, Indian politician, Governor of Assam.