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Chemistry

Twin Atoms with Different Weights: Isotopes

Isotopes are atoms of the same element that differ in weight because they have different numbers of neutrons. We look at atomic structure, stable and radioactive isotopes, how carb

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Physics

The Secret of Floating Iron Ships: Archimedes' Principle

An object in a fluid is buoyed up by the weight of the fluid it displaces. This piece explains Archimedes’ principle, why buoyancy comes from pressure differences with depth, when

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Earth science

The Science of Clouds: Reading the Signals in the Sky

Clouds are a familiar sight, yet few people understand how they form, what kinds there are, and what each one tells us. This article explains the principles of cloud formation, the

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Food & nutrition

Cooking Food Sealed in a Bag Under Water: Sous Vide

Sous vide is a cooking method in which food is vacuum-sealed in a plastic bag and cooked slowly for a long time in water held at a precise temperature. This article covers how it c

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Business administration

An Overview of Revenue Models for Online Businesses

One of the first things to consider when running a business is how to generate revenue through its services. Therefore, to sustain and grow a business, you should start with a clea

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General knowledge

The Brain’s Limit on Relationships: Dunbar’s Number

Why can contact lists grow while deep ties stay few? Dunbar’s Number says humans can sustainably keep only so many stable relationships—often about 150—layered as roughly 5, 15, 50