EARTH’S ARTERIES

Which is the longest river in the world? Learn 10 cool facts about rivers

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Rivers are the arteries of our planet. By connecting lands, lakes, and the sea, they enable the circulation of nutrients, sediments, and living beings. And despite holding a very small percentage of the water on Earth, they sustain most of its life!

Here are 10 intriguing facts about rivers from across the world.

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Over millions of years, rivers have carved some of the most awe-inspiring landscapes on Earth. From the Grand Canyon at the Colorado River to the Three Gorges at the Yangtze River, waterways are powerful sculptors, shaping valleys, canyons, and deltas by eroding rocks at some points and depositing the resulting sediments further downstream. Without rivers, we would live on a very different planet!

Image: Xuan Nguyen

Throughout history, rivers have served as vital arteries for human civilization. The earliest human settlements first sprouted along river banks - like the Tigris and Euphrates, the Nile, the Indus, and the Yellow River - drawn by abundant food, fertile soil, natural resources, and access to water for drinking and agriculture. Currently, freshwater fisheries sustain up to 550 million people! Rivers also function as transportation routes, and borders between countries.

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Rivers are teeming with life, hosting a diverse array of plants, animals, and microorganisms. In fact, they are some of the most diverse ecosystems on the planet, sustaining more fish species than the sea! Rivers also serve as corridors for land-based wildlife, keeping animal populations healthy and helping preserve biodiversity.

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Rivers play a crucial role in the water cycle, transporting vast quantities of water from land to sea. Every year, 38 trillion cubic meters of river water flow into the oceans! Most of this is actually rainwater, created through the evaporation of ocean water. Along their way, they also replenish groundwater reserves, nourishing ecosystems and sustaining human communities during dry spells.

Image: Philipp Potocnik

Healthy rivers also act as natural filters, purifying water along their course and removing pollutants. Wetlands, floodplains, and riparian zones help trap sediment and absorb excess nutrients, safeguarding downstream water quality. This is why it’s so important to fight pollution and preserve rivers’ capacity for regeneration. When this filter fails, problems go downstream and end up in the ocean, silently accumulating and causing serious ecological imbalances.

Image: Cédric Dhaenens

Rivers are a potent source of renewable energy, driving hydroelectric dams that generate electricity. Nowadays, dams store one-sixth of the water flowing in rivers, and hydropower accounts for 16% of the world’s electricity. However, though they are considered a greener form of energy, if they are not adequately planned hydroelectric dams can come at great cost to river ecosystems and communities.

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Rivers have long been cultural and spiritual symbols, revered by indigenous peoples and civilizations around the world. They feature prominently in myths, rituals, and religious beliefs, embodying concepts of life, renewal, and the divine. Rivers also create identity - there are at least 17 countries that are named after rivers, including India, Nigeria, Congo, and Belize! Moreover, they are hotspots for recreation, providing havens for birdwatching, camping, and hiking, drawing millions of visitors each year to their shores.

Image: Luke Oslizlo

Despite their importance, rivers face a myriad of threats, including pollution, habitat destruction, and overexploitation. It is currently estimated that at least 10,000 to 20,000 freshwater species have gone extinct or are on the brink of extinction. A staggering 37% of the world’s freshwater fish species are seriously threatened. Climate change exacerbates these challenges, leading to altered flow regimes, increased flooding, and habitat loss.

Image: Jordi Orts Segalés

Stretching over 4,130 miles, the Nile is not just the longest river in Africa but also the entire world. Originating from Lake Victoria in Uganda, it flows through eleven countries, including Egypt, where it empties into the Mediterranean Sea. From ancient times, the Egyptian and Sudanese kingdoms have heavily depended on the river and its annual cycles of flooding, and to this day most of the population and cities of Egypt lie along the valley of the Nile.

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The Amazon River in South America carries more water than any other river, accounting for approximately 20% of the total freshwater discharge into the oceans - it is estimated that every second, 84 olympic-sized pools are discharged into the sea from its mouth! It also has a massive basin, covering over 2.7 million square miles, most of which is part of the Amazon rainforest.

Not everyone is a car buff

10 car-related words to avoid getting fooled by the mechanic

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As long as you aren’t directly involved in it, not being savvy with a certain profession’s lingo is usually not a problem. But alas, exceptions exist, and these situations can create confusion and anxiety for the uninformed party in a conversation. Just like a patient who struggles to understand the complex terms a doctor uses to explain their condition, many people feel unsure when a mechanic explains a problem with their car. Listed below are 10 words and phrases that car buffs and mechanics use frequently. How many of these do you know?

Image: Tim Mossholder

In the context of cars, the term "banger" refers to traditional combustion engines. While many people are familiar with engine cylinders, not everyone knows how the term "banger" relates to them.

For example, some refer to four-cylinder engines as "four-bangers" because of the distinct "banging" sound they produce.

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When talking about pillars in a car context, we are referring to the structural divisions between the windows. The A-pillar typically denotes the section on each side of the windshield, the B-pillars are located between the driver and passenger windows, and the C-pillar is positioned toward the rear of the vehicle.

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A limited-slip differential reduces wheel slip with the least traction, by shifting a portion of the torque to the wheel with the most traction, therefore, improving the performance of a car. This results in better overall traction.

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Brake bias refers to how braking power is distributed between the front and rear wheels. Brake bias can either reference the front of the car or the rear, depending on where it’s dispersed. Brake bias is often expressed as a percentage of braking power sent to the front brakes (e.g., 52%).

Image: Luca Nicoletti

The camber is an adjustable element of the car’s wheels that sets the tilt angle. Depending on the direction of the tilt, camber is classified as either negative or positive. Each car’s camber setting is adjustable and varies based on the driver’s preference.

How a driver sets their camber affects how quickly the tires wear over time. When in doubt, always check with a specialist.

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Another expression relating to the brakes is the action of "bedding the brake pads." All brake pads require a bedding process to enhance performance, which involves creating a thin transfer film between the pads and the rotor.

Image: Chad Kirchoff

A diagnostic check takes place when a mechanic connects a laptop or specialized equipment to a car to detect documented faults. Each fault is assigned a unique code, and by accessing the car's electronic control unit (ECU), the specific number will identify what the problem is.

Most modern mechanics use computers that can connect to a car’s electronic system and read the error log for problems.

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In the automotive world, suspension bushings are small rubber components attached to suspension parts that help absorb shocks and vibrations from the road. Since they are made of rubber, they can deteriorate and wear out over time, requiring periodic replacement.

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The third and final brake-related term on this list, "spongy brakes," is an expression used to describe an instance where the brake pedal offers little resistance when pressed down. This typically indicates a lack of brake fluid, which is fairly cheap to buy and add.

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A car differential is a set of gears that splits engine torque, allowing the wheels to rotate at different speeds. This is especially important when turning, as the outer wheels must rotate faster than the inner wheels to cover more ground in the same amount of time.

The front differential is located between the two front wheels and distributes the engine’s power to the front wheels. In the same manner, the rear differential is located between the two rear wheels and distributes the engine’s power to the rear wheels.