Shakuntala Devi was an Indian writer and mathematician known colloquially as the "human computer." She was said to be able to perform complex mathematical calculations in her brain and then effortlessly shout out the answers! As the daughter of a circus artist, she was born into a poor household in southern India and began performing at a young age. Her father identified her as a young prodigy and took her to road shows where she demonstrated her mathematical abilities. She died on April 21, 2013, after a long period of suffering from respiratory, cardiac, and renal ailments.

Adolf Hitler was born in Braunau am Inn, Austria, on April 20, 1889. He is most known for being the head of the Nazi Party and for starting the Second World War. In July 1921, Adolf Hitler succeeded Anton Drexler as party chairman of the Nazi Party, and he was shortly given the title führer ("leader"). He was Germany's chancellor from January 30, 1933, and Führer and chancellor together from August 2, 1934. His ascension to power precipitated the Second World War and the Holocaust, which killed over six million Jews.

Manoj Bajpayee (born 23 April 1969), also known as Manoj Bajpai, is an Indian actor who primarily works in Hindi films but has also appeared in Telugu and Tamil films. He has three National Film Awards, six Filmfare Awards, and two Asia Pacific Screen Awards to his name. For his contributions to art, he received India's fourth-highest civilian honour, the Padma Shri, in 2019. On April 23, 1969, in a small village called Belwa near the city of Bettiah in West Champaran, Bihar, Bajpayee was born into a brahmin family. He is the second of five siblings, and he was named after actor Manoj Kumar. Poonam Dubey, one of his younger sisters, is a fashion designer in the film industry.

Abhishek Bachchan is an Indian actor who is the son of Amitabh Bachchan and Jaya Bachchan; his elder sister is Shweta Bachchan-Nanda. He is married to Aishwarya Rai, an actress and former Miss World. Abhishek began his career with the film Refugee, which was fairly popular and starring Kareena Kapoor. For around four years, he appeared in a few films that were not particularly successful. In 2004, he appeared in the film Dhoom, which became his first box office success. Soon after, in 2005, he released four consecutive blockbusters: Bunty aur Babli, Sarkar, Dus, and Bluffmaster.

J. Robert Oppenheimer who lived from April 22, 1904 to  February 18, 1967 was an American theoretical physicist and University of California, Berkeley professor of physics. Oppenheimer was the wartime director of the Los Alamos Laboratory and is widely regarded as the "Father of the Atomic Bomb" for his role in the Manhattan Project, the World War II effort that produced the first nuclear weapons. Oppenheimer was present at the Trinity test in New Mexico, where the first atomic bomb was detonated successfully on July 16, 1945. He later remarked that the explosion reminded him of a line from the Bhagavad Gita: "Now I am Death, the destroyer of worlds."

Elizabeth Alexandra Mary Windsor, the Duke and Duchess of York's first child, was born on April 21, 1926, and was baptised in the chapel at Buckingham Palace. She was educated at home alongside her younger sister, Princess Margaret, and subsequently served as a subaltern in the Auxiliary Territorial Service during World War II, rising to the rank of Junior Commander. The coronation took place in Westminster Abbey on June 2, 1953, and was broadcast worldwide on radio and, at the young Queen's request, on television, bringing the splendour of the occasion to hundreds of millions of people in ways never previously believed possible.

Andy Serkis is a British actor and director best known for his voice work and appearances in CGI-animated and motion capture films. He is most recognised for his portrayal of Gollum in 'The Lord of the Rings' trilogy and 'The Hobbit: An Unexpected Journey.' Serkis has played a variety of roles that have been represented on-screen with the use of motion capture technology. Andrew Clement G. Serkis was born on April 20, 1964, to Armenian doctor Clement Serkis and British teacher Lylie. He was born in Ruislip Manor, West London, England, and has four brothers and sisters.

Chetan Bhagat is an Indian author and columnist who was born on April 22, 1974. In 2010, he was named to Time magazine's list of the World's 100 Most Influential People. Bhagat earned a mechanical engineering degree from IIT Delhi and a PGP from IIM Ahmedabad. He began his career as an investment banker but left after a few years to pursue his passion for writing. He has ten novels and three non-fiction books to his credit. Five Point Someone, his first novel, was released in 2004.

Robbie Amell is a Canadian television and film actor best known for his roles as Stephen Jameson on The CW's 'The Tomorrow People' and Wesley Rush in the film 'The Duff.' Robbie, who entered the world of fame and glamour at the age of six, began his career as a model and actor in modest advertising and TV shows before breaking through in the national television and film industries. Robert Patrick "Robbie" Amell was born in Toronto, Canada, on April 21, 1988, to parents Jo and Rob Amell. He has a sister with whom he began doing small-time commercials and modelling jobs.

John Felix Anthony Cena, born April 23, 1977, is a professional wrestler, actor, and former rapper from the United States who is currently signed to WWE. He is widely regarded as one of the greatest professional wrestlers of all time, and he shares the record for the most world championship reigns in professional wrestling history with Ric Flair. Cena moved to California in 1998 to pursue a career as a bodybuilder after being born and raised in West Newbury, Massachusetts. In 1999, he made his professional wrestling debut for Ultimate Pro Wrestling (UPW). In 2001, he signed with the World Wrestling Federation (WWF, now WWE), and was initially assigned to Ohio Valley Wrestling (OVW). He rose to prominence in the WWE by adopting the persona of a trash-talking rapper.

On April 21, 2019, Volodymyr Zelenskyy was elected President of Ukraine. Mr Zelensky has earned more than 73% of the vote with virtually all ballots tallied in the run-off vote, with incumbent Petro Poroshenko lagging well behind on 24 percent. Russia says it wants him to demonstrate "good judgement," "honesty," and "pragmatism" in order for ties to improve. Russia is a supporter of rebels in eastern Ukraine. Volodymyr Zelensky, a Ukrainian comedian, has won the country's presidential election by a landslide.

William Shakespeare (26 April 1564 – 23 April 1616) was a playwright, poet, and actor from England. He is widely regarded as the greatest English-language writer and the world's greatest dramatist. He is commonly referred to as England's national poet and the "Bard of Avon" (or simply "the Bard"). His extant works, including collaborations, include 39 plays, 154 sonnets, three long narrative poems, and a few other verses, the authorship of which is unknown. His plays have been translated into every major living language and have been performed more frequently than any other playwright's. His works are still being studied and reinterpreted.

To avoid interference, the US government opted to connect the computers at NORAD's headquarters at Cheyenne Mountain using fibre optics. About 1.5 miles underneath downtown Chicago, the first optical telephone communication system was established. Each optical cable was capable of carrying 672 voice channels.

Amber Laura Heard (born April 22, 1986) is a film and television actress from the United States. Heard had her first starring role in the 2006 horror film All the Boys Love Mandy Lane, after a series of small roles. She rose to prominence as a supporting actress in the films Never Back Down and Pineapple Express. Heard first appeared in the DC Extended Universe in 2017 as Atlantean queen Mera in the superhero films Justice League, Aquaman, and Zack Snyder's Justice League. Heard has been a global spokesperson for the cosmetics company L'Oréal Paris since 2018. She is also a human rights activist.

Every year on April 22, Earth Day commemorates the beginning of the contemporary environmental movement in 1970. It may be difficult to believe that prior to 1970, a business could blast black clouds of poisonous smoke into the air or dump tonnes of hazardous trash into a nearby stream and do it legally. They couldn't go to court to halt it. Senator Gaylord Nelson established Earth Day in the spring of 1970 to bring this issue onto the national agenda. Twenty million Americans demonstrated in various places around the country, and it worked! The U.S. Environmental Protection Agency was established in December 1970 after Congress approved the establishment of a new government agency to address environmental challenges.

Dev Patel was born on April 23, 1990, in Harrow, London, UK, to Raj Patel, an Indian-origin IT consultant, and Anita Patel, a care worker. Dev Patel is a well-known English actor who is best recognised for his performance in the feature film 'Slum Dog Millionaire.' In 2007, he made his acting debut in the British TV drama series 'Skins,' playing a Pakistani youngster growing up in England. The actor was cast in this role despite having no prior acting experience or professional training. He gained to prominence in 2008 as 'Jamal Malik' in the highly acclaimed feature film 'Slum Dog Millionaire.'

William Shakespeare was a well-known English poet, dramatist, and actor who was born in Stratford-upon-Avon in 1564. His birthday is most widely observed on April 23, which is also the date he is said to have died in 1616. William Shakespeare acquired the ancient family property in Henley Street after his father died in 1601, a portion of which was then leased to tenants. Stratford saw more property investments, including the purchase of 107 acres of land in 1602. Shakespeare died on April 23, 1616, at the age of 52, in Stratford-upon-Avon. He was laid to rest in the sanctuary of Holy Trinity Parish Church.

John Joseph Nicholson, born April 22, 1937, is a retired American actor and filmmaker with a career spanning more than 50 years. He is well-known for playing a variety of starring and supporting roles, including comic characters, romantic leads, anti-heroes, and villains. He played the "eternal outsider, the sardonic drifter" in many of his films, someone who rebels against the social structure. He has received numerous honours, including three Academy Awards.

Kal Penn was born Kalpen Suresh Modi on April 23, 1977, in Montclaire, New Jersey, USA. Kal Penn is an Indian-American actor, chef, producer, and government servant. He has played the iconic TV character Lawrence Kutner on the show 'House,' as well as Kumar Patel in the film series 'Harold & Kumar.' He has also gained widespread appreciation for his work on the film 'The Namesake.' Penn has also taught in the Cinema Studies Program at the University of Pennsylvania. Penn was an Associate Director in the White House Office of Public Engagement from April 2009 until July 2011.

James McAvoy is a well-known Scottish actor who has appeared in films, television shows, and on stage. McAvoy, who was born in Glasgow, Scotland, had his film debut as a youngster in The Near Room, in which he played a tiny role. He rose to prominence after starring in Bollywood Queen, a British Indian adaptation of Romeo and Juliet in which he played the major role. James McAvoy was born in Glasgow, Scotland, on April 21, 1979. His mother, Elizabeth, was a mental nurse, and his father, James McAvoy Sr., was a builder. He has a sister, Joy, and a half-brother, Donald.

The First Battle of Panipat was fought between Babur's soldiers and Ibrahim Lodhi's forces. The battle took place on April 21, 1526. The employment of artillery by Babur's army aided their success in the conflict. Lodi forces were lacking in artillery expertise, and the sound of canons spooked the Lodi war elephants. From 1517 until 1527, the Sultanate was ruled by Ibrahim Lodi, a superb warrior but an undiplomatic monarch. The First Battle of Panipat ended in Ibrahim Lodi's death, as well as the end of the Lodi Dynasty and the Delhi Sultanate in India. In addition, with the collapse of the Sultanate, Mughal rule in India started.

Satyajit Ray, an Indian film director, was known for his sophisticated and profoundly affecting depictions of local family life. His works have a humane warmth, crystalline clarity, and mythic evocativeness that allows them to transcend the limitations of alien cultural sensibilities. He received a special Academy Award for Lifetime Achievement in 1992. He passed away on April 23, 1992. His burial was held with full state honours and was proclaimed an official holiday by the West Bengal government. Over a million people came to pay their respects.

On April 23, 2005, at 8:31:52 p.m. PDT, or April 24, 2005, at 03:31:52 UTC, the video "Me at the Zoo" was uploaded to YouTube for the first time. It shows YouTube co-founder Jawed Karim, 25, standing in front of the elephants at the San Diego Zoo, noting their long trunks. On April 23, 2005, the first YouTube video was uploaded – exactly 15 years ago . Jawed Karim, co-founder of YouTube, posted the 18-second video, titled "Me at the Zoo." Since then, it has received over 90 million views. It is still the only video on Karim's channel.