Summary:

• **What the Miller-Urey Experiment Was**: In 1952, two scientists named Stanley Miller and Harold Urey created an experiment to test if life's building blocks could form naturally on early Earth. They filled a glass container with gases they thought existed billions of years ago, added water, and used electricity to simulate lightning strikes.

• **What They Discovered**: After running their experiment for a week, Miller and Urey found that simple amino acids (the basic ingredients needed to make proteins and living things) had formed inside their container. This showed that the chemicals needed for life could be created without living organisms, suggesting life on Earth might have started from non-living chemicals.

• **Why It Matters**: This groundbreaking experiment helped scientists understand how life might have begun on our planet and showed that the building blocks of life can form naturally under the right conditions, which is a key part of understanding the origins of all living things.