"I Want to Hold Your Hand" reached #1 on the Billboard Hot 100 chart in February 1964, marking the beginning of the British Invasion in American pop music. The song stayed at #1 for 7 weeks and sold over 5 million copies worldwide.

Albert Einstein, the renowned German-born theoretical physicist, developed the theory of relativity, which fundamentally changed our understanding of space, time, gravity, and the relationship between energy and matter. His work laid the foundation for modern physics.

Parrots, particularly African Grey Parrots and Amazon Parrots, are famous for their ability to mimic human speech and other sounds with remarkable accuracy. They are highly intelligent birds and can learn an extensive vocabulary.

Death of a Salesman' is perhaps one of the most famous works of Arthur Miller. Written in 1949, this play is Miller's biting critique of the American Dream, telling the tragic story of a poor travelling salesman, Willy Loman.

Eli Whitney patented the cotton gin in 1794. The machine automated the separation of cotton fibers from their seeds, revolutionizing the cotton industry in the southern United States.

Though The Magician's Nephew is chronologically the first book in the Narnia series, The Lion, the Witch and the Wardrobe was the first to be published in 1950 and introduced readers to the world of Narnia for the first time.

Mycology is a branch of biology concerned with the study of fungi, including their genetic and biochemical properties, their taxonomy, and their use to humans as a source for tinder, traditional medicine, food, and entheogens, as well as their dangers, such as toxicity or infection.

World War II ended in 1945 with the surrender of Germany in May and Japan in August, following the atomic bombings of Hiroshima and Nagasaki. The war lasted nearly 6 years and involved over 30 countries.

Baby swans, known as cygnets, retain this name until they reach one year of age. Cygnets are typically grey or brown in color, and don't develop the distinctive white plumage of adult swans until they are about a year old and undergo their first molt.

Although there was some controversy and competition around the invention of the telephone, including a legal battle with Elisha Gray, Alexander Graham Bell is officially recognized as the inventor of the first practical telephone. He was granted the first US patent for the invention of the telephone in 1876.