science

The Big Necessity

The Big Necessity is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand The Big Necessity rather than just read about it. In short: The Big Necessity: The Unmentionable World of Human Waste and Why It Matters (published in the United Kingdom as The Big Necessity: Adventures in the World of Human Waste), written by Rose George, is a descriptive representation of the history, advancement, cultural variation, solutions, and international need of sanitation. This work, written for the purpose of global awareness of sanitation, highlights the current…

Key takeaways

The Big Necessity belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect The Big Necessity to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of The Big Necessity from memory before moving on to harder problems.

Reference excerpt

The Big Necessity: The Unmentionable World of Human Waste and Why It Matters (published in the United Kingdom as The Big Necessity: Adventures in the World of Human Waste), written by Rose George, is a descriptive representation of the history, advancement, cultural variation, solutions, and international need of sanitation. This work, written for the purpose of global awareness of sanitation, highlights the current state of a global crisis. George gives insight into how sanitation around the world depicts the standard of living in that area. George uses her own personal experiences as examples to explain the sanitary conditions of areas around the world. Worldwide, 2.6 billion people (40% of the world's population) do not have sanitary facilities or systems to dispose of waste; Studies show that 95% of human waste is released into lakes, rivers, and ponds in developing countries. George discusses the lack of sanitation and toilets for the majority of the world and the resultant infection of water supplies causing 10% of the world’s communicable diseases, while access to a toilet adds 20 years to the average life.

References

Worked examples

Example 1 — a first encounter with The Big Necessity

Start with the simplest possible case. Write down what The Big Necessity claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to The Big Necessity before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about The Big Necessity ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of The Big Necessity

In research: The Big Necessity appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses The Big Necessity in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: The Big Necessity is common in secondary-school and first-year university syllabi. It links to neighbouring topics 2008 English-language non-fiction books, 2008 non-fiction books, American non-fiction books, so understanding it makes those chapters shorter.
In everyday life: Look for The Big Necessity outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study The Big Necessity in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what The Big Necessity means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain The Big Necessity out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is The Big Necessity in simple terms?

Why does The Big Necessity matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study The Big Necessity?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on The Big Necessity.