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.

Guglielmo Giovanni Maria Marconi (25 April 1874 – 20 July 1937) was an Italian inventor and electrical engineer best known for developing the first practical radio wave-based wireless telegraph system. As a result, Marconi is widely regarded as the inventor of radio, and he shared the Nobel Prize in Physics in 1909 with Karl Ferdinand Braun "in recognition of their contributions to the development of wireless telegraphy." Marconi was also a businessman and entrepreneur who founded The Wireless Telegraph & Signal Company in the United Kingdom in 1897. (which became the Marconi Company). King Victor Emmanuel III of Italy ennobled Marconi as a Marchese (marquis) in 1929, and in 1931, he established Vatican Radio for Pope Pius XI.

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.

Sachin Ramesh Tendulkar is a former Indian cricketer who was born in Bombay, Maharashtra on April 24, 1973. He is recognised as one of the top batters in the world. He is a part-time bowler capable of bowling both off and leg breaks. Sachin was primarily a right-handed opening batter who also batted in the middle order. He holds the record for the most runs scored in both Test and ODI cricket. He was the first batter in white ball history to reach a double century. Even though he was barely 5 feet 5 inches tall, he hooked the ball as well as a tall Mohinder Amarnath.

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."

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.

Varun Dhawan was born in Mumbai, Maharashtra, India on April 24, 1987. David Dhawan, his father, is a well-known film director. Karuna Dhawan is his mother's name. Rohit, his elder brother, is a film director. Varun Dhawan is a well-known Indian actor. He is regarded as one of the highest-paid celebrities in the country. Varun made his acting debut with Sidharth Malhotra and Alia Bhatt in Karan Johar's 2012 adolescent drama film "Student of the Year," for which he won a Filmfare nomination for Best Male Debut.

Alfredo James Pacino, born April 25, 1940, is a well-known American actor and director. Throughout his five-decade career, he has received numerous honours, including an Academy Award, two Tony Awards, and two Primetime Emmy Awards, making him one of the few actors to have won the Triple Crown of Acting. He has also received the Academy of Motion Picture Arts and Sciences Life Achievement Award, the Cecil B. DeMille Award, and the National Medal of Arts.

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.

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.

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.

To commemorate the occasion, the state-owned television network shared the video above on its official Twitter account, which depicts its famed revolving logo — in colour. "On April 25, 1982, Doordarshan began the test run of India's first colour transmission," the caption says. This was a huge accomplishment at the time since it revolutionised television viewing for Indian viewers. This enabled sports enthusiasts to watch the Asian Games in colour that year. Soon after, Doordarshan debuted the first Indian soap opera, Hum Log, followed by blockbusters such as the Ramayana and the Mahabharata.

Arijit Singh (born April 25, 1987) is an Indian singer-composer. He primarily sings in Hindi and Bengali, but he has also performed in a number of other Indian languages. He has received a National Award as well as a record six Filmfare Awards. He is frequently cited as one of the best singers in the Indian and Pakistani music industries, and he has a large fan base across South Asia. He is also referred to as the "King of Playback Singing." Singh began his career in 2005, when he appeared on the popular reality show Fame Gurukul.

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.

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.

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 (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.

Sawai Raja Sur Singh, also known as Suraj Mal, was the Raja of the Marwar Kingdom from 24 April 1571 until 7 September 1619. His sister was Emperor Jahangir's third wife and Shah Jahan's mother. On his father's death on July 11, 1595, he ascended to the throne. In acknowledgment of his great achievements, he received the hereditary title of Sawai Raja from Princes Murad and Daniyal Mirza in the conquest of Gujarat and the Deccan for Emperor Akbar. On September 7, 1619, he perished while on active duty at Mahaikat, Deccan.

Gedhun Choekyi Nyima was born on April 25, 1989, and is the 11th Panchen Lama of the Gelugpa school of Tibetan Buddhism, as recognised and announced by the 14th Dalai Lama on May 14, 1995. Three days later, on May 17, the Chinese government kidnapped the 6-year-old Panchen Lama after the State Council of the People's Republic of China failed to install a replacement. A Chinese substitute is viewed as a political tool to undermine the Dalai Lama's reincarnation, which is traditionally recognised by the Panchen Lama. Gedhun Choekyi Nyima, along with his family, has been detained by the Chinese government in an undisclosed location since 1995. Chadrel Rinpoche, his khenpo, and Jampa Chungla, another Gelugpa monk, were also detained.

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.