Charlie Brown is a central character in the comic strip Peanuts by Charles M. Schulz. The comic strip was first published in 1950 and continues to be a widely recognized and beloved piece of pop culture today.

The Greenhouse Effect is a natural process where certain gases (like carbon dioxide, methane) in a planet's atmosphere trap heat from the sun, preventing it from escaping back into space, thereby warming the planet. The increase in the emission of these gases due to human activities is causing a more intense Greenhouse Effect, leading to global warming.

"Arvo," short for "afternoon," is a common Australian slang term used to describe the time after midday and before the evening.

The McDonald brothers started the first McDonald's restaurant in 1940 in San Bernardino, California. Ray Kroc later partnered with the brothers to franchise the restaurants, eventually buying them out in 1961 for $2.7 million.

Red blood cells have no nucleus! Prior to reaching maturity, red blood cells eject their nuclei in a process called enucleation. This allows the mature red blood cell to carry more oxygen and squeeze through narrow capillaries that it otherwise wouldn't have been able to cross.

Mars has a smaller mass and lower surface gravity compared to Earth. This means you would weigh only about 38% as much on Mars as you do on our planet. For example, a 150 pound person on Earth would weigh around 57 pounds on Mars.

The Phantom of the Opera debuted on Broadway at the Majestic Theatre in January 1988. As of March 2020, it is the longest-running show in Broadway history with over 13,000 performances.

Pb is the chemical symbol for lead, which comes from the Latin word "plumbum". Lead is a heavy metal that was widely used in the past but is now known to be toxic if ingested or inhaled.

The kangaroo is one of the national symbols of Australia, often depicted alongside the emu on the Australian Coat of Arms. The choice of these two animals is symbolic as neither the kangaroo nor the emu can move backward easily, reflecting a nation moving forward.

The myth of El Dorado, which means 'the golden one' in Spanish, refers to a city, king, or kingdom believed to be located in South America, which was fabulously rich in gold and other treasures. This legend enticed European explorers for centuries, although the city was never found.