How Stuff Works

Hinduism is the oldest religion that's still widely practiced. WESTOCK PRODUCTIONS / Shutterstock In any list of the oldest religions in the world, one thing becomes clear fast: Religion began long before written records. The bulk of the human religious experience predates recorded history, so tracing the exact start of any faith is tricky. Some belief systems grew slowly out of rituals, stories, and spiritual beliefs that took shape over centuries. That makes this topic bigger than a timeline.

Sometimes even the ocean water is too warm to effectively beat the heat. jokerpro / Shutterstock The hottest states in the U.S. are not just about raw temperatures. They reflect a mix of average annual temperature, humidity, geography, and how heat feels to the human body. When you compare average temperatures across the country, a clear pattern appears: The southern states dominate. That pattern makes sense once you look at climate zones.

As long as you follow some straightforward guidelines—but really follow them—you're safe to imbibe. Unai Huizi Photography / Shutterstock Can you drink in Dubai? Yes, but only under tightly defined rules. Dubai allows drinking alcohol for non-Muslims who are 21 or older, yet the law is shaped by Islamic tradition, local traditions, and the city’s role as a global tourism hub.

By: Nico Avelle | The short-beaked echidna is one of only five mammals that lays eggs. Ken Griffiths / Shutterstock When people think about animals that lay eggs, birds usually come to mind first. But many animals that lay eggs that are not birds exist across the animal kingdom, from reptiles and amphibians to fish, insects, and even a few unusual mammals. In fact, egg laying is one of the oldest reproductive strategies on Earth.

You can see why tourism is one of the biggest drivers in Palau's economy. Fidelia AZ / Shutterstock Ranking the smallest economies in the world sounds simple, but it opens a window into how the global economy really works. When you rank smallest economies by nominal GDP, you are looking at gross domestic product at current prices, not quality of life, political stability, or human resilience.

By: Nico Avelle | The waxy monkey tree frog is one of the few non-mammals to have opposable thumbs. Lauren Suryanata / Shutterstock Animals with opposable thumbs stand out in the animal kingdom because they can grasp, hold, and manipulate objects with precision. An opposable thumb means the thumb can move across the hand to touch the other fingers, creating a strong precision grip. This ability has shaped survival strategies across species, from tool use to climbing trees and gathering food.

A lot of official country names are much longer than you think. jointstar / Shutterstock Identifying the longest country name might sound like a simple trivia challenge, but it actually reveals a lot about history, politics, and identity. The longest official names of countries often include details about their government, geography, or past unions. These formal names are rarely used in everyday speech, but they carry meaning about how a country defines itself.

Big Pharma drives trillions of dollars each year. Leonid Sorokin / Shutterstock The biggest pharmaceutical companies play a central role in the global economy by developing drugs, vaccines, and medical solutions that shape modern healthcare. These pharma companies dominate the pharmaceutical industry through massive market capitalization, extensive research pipelines, and strong commercial execution across multiple markets.