The Earth is the third planet from the Sun and is the only known planet in the universe to support life.
The universe is estimated to be around 13.8 billion years old, and the observable universe is thought to contain more than 100 billion galaxies.
The human body is made up of about 60% water, and the brain is composed of about 73% water.
The Great Barrier Reef, located off the coast of Australia, is the largest coral reef system in the world and is home to thousands of species of marine life.
The tallest mountain in the world is Mount Everest, which stands at 8,848 meters (29,029 feet) above sea level.
The largest continent in the world is Asia, and the largest country in the world by land area is Russia.
The speed of light is approximately 299,792,458 meters per second and is considered the fastest known speed in the universe.
The human body has 206 bones, and the smallest bone in the human body is the stapes bone in the ear.
The planet Mars has the largest volcano in the solar system, called Olympus Mons, which stands at 22 kilometers (14 miles) high.
The oldest known city in the world is Jericho, which is located in modern-day Palestine and is believed to have been continuously inhabited for over 11,000 years.