The "Mona Lisa" has been displayed in the Louvre Museum since 1797 and is considered one of the most famous paintings in the world. The painting is known for its intriguing subject's expression, which many find enigmatic.

Hydrogen is the lightest and most abundant chemical element, constituting roughly 75% of the universe's elemental mass. Stars are primarily composed of hydrogen in its plasma state.

In Buddhism, Gautama Buddha, also known simply as the Buddha, is widely revered as the central figure of worship. He is considered as the founder of Buddhism and is revered not as a god, but as a teacher who has awakened to spiritual understanding and enlightenment.

The cruciate ligaments are paired ligaments in the knee joint. They are called cruciate because they cross each other in the middle of the knee, with the anterior cruciate ligament (ACL) in front and the posterior cruciate ligament (PCL) in back. These ligaments are important for the stability and proper movement of the knee.

Rachel Carson, a marine biologist and conservationist, is often called the "Mother of Modern Environmentalism" due to her influential work "Silent Spring." The book, published in 1962, highlighted the harmful effects of pesticides on the environment and helped to spark the modern environmental movement.

Scurvy is a disease resulting from a lack of vitamin C (ascorbic acid), which is required for the synthesis of collagen in humans. The symptoms of scurvy include swollen, bleeding gums, and the opening of previously healed wounds. Historically, scurvy was common among sailors and pirates who were at sea for long periods without access to fresh fruits and vegetables.

Before becoming The Beatles, the band was formed in 1957 as The Quarrymen by John Lennon. It was named after Quarry Bank High School, which Lennon attended.

Biodiversity encompasses the diversity within species, between species, and of ecosystems. It is essential for the survival and sustainability of life on Earth, as each species plays a unique role in the complex web of life.

White blood cells, or leukocytes, are a crucial part of the immune system. They help protect the body against both infectious disease and foreign invaders. Different types of white blood cells have varying roles, including creating antibodies and engulfing bacteria.

Perennial plants are plants that live for more than two years, continuing to grow and produce flowers and seeds throughout their life cycle. They include trees, shrubs, and some grasses and herbs.