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1066 topics

Sports and games

Counting each pairing once in a round-robin tournament

Five entrants in a single round-robin tournament each have four opponents. That looks like 20 matches until you notice that A against B and B against A describe the same meeting. Counting each pair once gives 10 matches, a different question from how many rounds or days the event needs.

3–5 min
Chemistry and materials

Why does ice take up more room than water?

An ice cube floats in the water it came from, and freezing water can push against its container. Ordinary ice arranges water molecules differently from the liquid, connecting a microscopic pattern with a familiar change in volume.

3–5 min
Music and sound

Performing a film's footsteps after filming

When an actor walks across a gravel path in a movie, the microphone on set is focused on capturing clean dialogue, not their shoes. Months later in a post-production studio, Foley artists watch the scene on a screen and perform every footstep, rustling coat, and clinking glass in real time, often using props that look nothing like the object on camera.

5–7 min
Business

When to reorder is different from how much to order

An inventory can need a new order while there is still stock on the shelf. The reorder point accounts for what may be used before a delivery arrives; the order quantity answers a separate question about how much to buy. Stock already on order can also matter when deciding whether another order is needed.

5–7 min
Computers and AI

Same emoji, different picture

The same emoji can arrive with a different expression or style from the one you saw when sending it. Unicode identifies characters and sequences, while software platforms choose artwork and decide what their versions support.

2–3 min
Psychology

Why does the example you remember feel so important?

A vivid example can come to mind faster than a larger body of less memorable evidence. The availability heuristic concerns how that ease of recall can influence judgment, without establishing how common or representative the event really is.

3–5 min
History

Penny post came before the Penny Black

Britain’s uniform inland letter rate began in January 1840; the Penny Black stamp followed in May. The reform and the adhesive evidence of payment were separate steps. Earlier charges depended on distance and sheets, while the new rate still had conditions, including weight and whether postage was prepaid.

5–7 min
Environment and climate

Where does the water go in a rain garden?

Rain runs quickly off a roof or pavement, but a planted hollow can give it somewhere to pause. A rain garden's ability to hold water and let it enter the soil depends on its surroundings and ground conditions.

3–5 min
Earth and weather

Why can grass become wet overnight without rain?

Grass can collect droplets even when no rain has fallen. If its surface cools enough for water vapor nearby to condense, dew forms from moisture already present in the air.

2–3 min
Arts and culture

How to sew on a button that stays on

A replacement shirt button needs to line up with its buttonhole and leave enough room for the fabric to fasten. Repeated stitches hold it in place, while securing the thread helps keep the repair from unraveling. The small gap beneath the button can matter as much as the visible stitches.

2–3 min
Economics and money

How can your share count double without your stake growing?

A two-for-one stock split divides the same proportional ownership into more units. The mechanical adjustment to share count and reference price changes the packaging of the stake, while later market movements remain a separate matter.

2–3 min

12 of 1066 topics shown

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Find a question that interests you, follow the reading links, and choose what you want to explain. The research, examples, and structure are yours to develop. Learn more about what makes a speech informative.

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Start with something you are curious about and consider what your audience would want to understand. You can narrow the collection by subject and suggested length. Those lengths are estimates, so check your timing as you develop and rehearse your speech.

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Each reading note describes what the linked material offers. Some readings are technical, and some provide only an abstract or overview. Check the original source, its context, and any claims you plan to use. A starting reading list is not an exhaustive review of a subject.

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Arts and culture

Business

Chemistry and materials

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Communication

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Earth and weather

Economics and money

Education and learning

Energy

Engineering and inventions

Environment and climate

Ethics and philosophy

Food

Health and the body

History

Language

Law and rights

Maths and statistics

Media and information

Music and sound

Nature and biology

Physics

Politics and society

Psychology

Sales and negotiation

Space

Sports and games

Work and leadership

Informative Speech Topic Finder: 1066 Ideas to Explore | speaking.app