"I Dreamed a Dream" is a song from Les Misérables, which is a musical adaptation of Victor Hugo's novel of the same name. The song is a powerful ballad that expresses the despair of the character Fantine. The musical premiered in Paris in 1980 and in London's West End in 1985.

CFCs were widely used in refrigeration, air conditioning, foam blowing, and aerosol propellants. Due to their capability to break down ozone molecules in the stratosphere, they contribute significantly to ozone layer depletion. The Montreal Protocol was agreed upon in 1987 to phase out the production and consumption of ozone-depleting substances.

The Dunning-Kruger effect is a cognitive bias in which people with low ability at a task overestimate their ability. It was identified by social psychologists David Dunning and Justin Kruger in a study published in 1999.

Tornadoes form under certain types of thunderstorms called supercells. They can be among the most violent phenomena of all atmospheric storms we experience. The United States experiences the highest number of tornadoes in the world annually, with an average of 1,200 tornadoes.

Hydrogen, with just one proton and one electron, is the simplest and most abundant element in the universe. It is estimated to make up about 75% of all baryonic mass.

Diwali is a major Hindu festival celebrated annually every autumn in the northern hemisphere (spring in the southern hemisphere). The festival spiritually signifies the victory of light over darkness, good over evil, knowledge over ignorance, and hope over despair. Diwali is also celebrated by Jains, Sikhs, and some Buddhists.

Italy has a wealth of cultural history and boasts the highest number of UNESCO World Heritage Sites, with more than 50 inscribed on the list. These include the historic centers of Rome, Florence, and Venice, as well as archaeological sites like Pompeii and Herculaneum.

The Battle of Seven Oaks took place on June 19, 1816, near the Red River Colony (in what is now Manitoba, Canada). It was part of the long-standing conflict between the Hudson's Bay Company and the North West Company, rival fur-trading companies in Canada.

Barry Allen is the most famous version of The Flash, known for his super-speed, which allows him to do things like running on water or traveling through time. He first appeared in "Showcase" #4 in 1956. There have been other characters who have taken on the mantle of The Flash, including Jay Garrick, Wally West, and Bart Allen.

Oktoberfest began in Munich in 1810 to celebrate the October marriage of Bavaria's Crown Prince Ludwig to Princess Therese. The public festivities have since evolved into a worldwide phenomenon celebrated every year, with Munich's event being the largest, drawing millions of visitors annually.