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Earth Day, held every year on April 22nd, began in 1970 as a grassroots movement to raise awareness about pollution and environmental damage. What started with millions of Americans taking to the streets has grown into a global event, now involving over 190 countries. Today, it serves as a reminder to protect the planet—whether through small daily actions or large-scale climate initiatives.

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Halitosis

Is the medical term for persistent bad breath, usually caused by bacteria breaking down food particles in the mouth. While often linked to oral hygiene, it can sometimes signal underlying issues like gum disease or dry mouth.

How Booster Rockets Work

Rocket boosters are the powerful first stage of a launch, carrying large amounts of fuel and providing the thrust needed to lift a rocket off the ground. Once that fuel is used up, the boosters detach to shed excess weight—either falling back into the ocean or, in modern systems, landing for reuse.

This makes launches more efficient, as the rocket no longer has to carry empty fuel tanks, allowing it to travel faster and use less fuel to reach orbit.

Longest Winning Streaks in Sport

Some of sport’s greatest dynasties are defined by incredible streaks like:

Guess the City

* This topic has been previously featured. Spaced repetition improves your learning by helping you retain information for longer.

Apple’s Key Technology Release Dates

The Mystery of Edwin Drood

Charles Dickens’ The Mystery of Edwin Drood was meant to be a gripping murder mystery — but the real mystery is that it was never finished. Dickens died in 1870, leaving the novel incomplete and ending mid-sentence. To this day, no one knows for sure who the killer was or how the story ends. The unfinished book has sparked endless theories, fan-written endings, and adaptations, making it one of literature’s most enduring whodunits — without a final answer.

* This topic has been previously featured. Spaced repetition improves your learning by helping you retain information for longer.

Justin Bieber

Rose to global fame as a teenager after being discovered on YouTube, with early hits like Baby turning him into a pop sensation almost overnight. As his career evolved, he shifted toward a more mature sound with albums like Purpose, producing global hits such as Sorry and Love Yourself.

Despite intense media attention, Bieber has remained one of the most influential and commercially successful artists of his generation.

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