science

MARINA

MARINA 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 MARINA rather than just read about it. In short: MARINA is an NSA database and analysis toolset for intercepted Internet metadata (DNI in NSA terminology). The database stores metadata up to a year.

Key takeaways

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

Reference excerpt

MARINA is an NSA database and analysis toolset for intercepted Internet metadata (DNI in NSA terminology). The database stores metadata up to a year. According to documents leaked by Edward Snowden:The Marina metadata application tracks a user's browser experience, gathers contact information/content and develops summaries of target ... [o]f the more distinguishing features, Marina has the ability to look back on the last 365 days' worth of DNI metadata seen by the SIGINT collection system, regardless whether or not it was tasked for collection. [Emphasis in original NSA document.]The stored metadata is mainly used for pattern-of-life analysis. US persons are not exempt because metadata is not considered data by US law (section 702 of the FISA Amendments Act). MARINA's phone counterpart is MAINWAY.

References

Illustrations

Worked examples

Example 1 — a first encounter with MARINA

Start with the simplest possible case. Write down what MARINA 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 MARINA 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 MARINA 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 MARINA

In research: MARINA 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 MARINA 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: MARINA is common in secondary-school and first-year university syllabi. It links to neighbouring topics Database stubs, Mass surveillance, National Security Agency, so understanding it makes those chapters shorter.
In everyday life: Look for MARINA 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 MARINA in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what MARINA 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 MARINA out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is MARINA in simple terms?

MARINA is an NSA database and analysis toolset for intercepted Internet metadata (DNI in NSA terminology). The database stores metadata up to a year.

Why does MARINA 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 MARINA?

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 MARINA.