Yes, you really do need two types of measuring cups. Here's why

Why are there Dry and Liquid Measuring Cups? What's the difference?

Dry versus Liquid Measuring Cups - Crazy for Crust

Dry Vs. Liquid Measuring Cups: Here's What You Need To Know

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How to Brine - COOKtheSTORY

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Are Liquid and Dry Measuring Cups the Same?

Weight vs Volume Measurements in Baking and the Best Way to Measure Flour

Measurement Equivalents

What's the Difference Between Dry and Liquid Measuring Cups?, Easy Baking Tips and Recipes: Cookies, Breads & Pastries : Food Network

Dry versus Liquid Measuring Cups - Crazy for Crust

Is There Really a Difference Between Liquid and Dry Measurements?

What does a cup of flour weigh? It's surprisingly complicated - Los Angeles Times

How to Measure Flour (without a scale!)

What are Different Types of Measuring Cups? (with pictures)