# Math

1. Math

### Scientists Say: Pi

Pi is the ratio of a circle’s circumference to its diameter. But some mathematicians say life would be easier if we used a different ratio instead.

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2. Math

### Explainer: What is statistics?

Scientists use statistics to design studies, analyze data and evaluate uncertainty. You’ll find it in biology, climate change, medicine and more.

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3. Math

### Beyond crystal balls: How to make good forecasts

Science shows mounds of data and some math are key to predicting future events.

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4. Math

### Better data lead to better forecasts

Scientists turn to mathematical models to make good predictions. But if they don’t put good data into those models, they won’t get reliable forecasts. So good data are key.

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5. Math

### Scientists Say: Outlier

Data points often fall within a normal range. When one data point sticks out a lot, it might be an outlier.

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6. Math

A man died soon after opening a mummy’s tomb. But don’t assume the mummy killed him. Statistics help explain why coincidences may not be meaningful.

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7. Math

### Scientists Say: Algebra

Algebra is a type of mathematics that studies symbols and how they can be shifted around.

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8. Space

### Meet ‘Pi’ — a new Earth-sized planet

Searching through data from NASA’s K2 Mission, researchers found a new planet. Some call it K2-315b, others smile and refer to it as “Pi Earth.”

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9. Physics

### Scientists Say: Velocity

Velocity is more than speed. It is both speed and the direction in which an object is traveling.

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10. Computing

### Explainer: What is an algorithm?

These step-by-step instructions underlie social media, internet searches and other computer-based activities. But what are they exactly? We explain.

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11. Animals

### To figure out your dog’s ‘real’ age, you’ll need a calculator

What’s your dog’s human-equivalent age? Just multiply how old it is times seven, right? Uh, no. And here’s why.

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12. Humans

### When it comes to downing hot dogs, science says there’s a limit

Humans may be able to eat only 83 hot dogs in 10 minutes, new research suggests.

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