Human: How do I know if the eggs I'm buying are fresh? Assistant: 
You can check for freshness by looking at the color of the yolk. A fresh egg will have a bright yellow yolk, while an older egg may have a darker or even greenish-yellow yolk. Additionally, you should feel the weight and texture of the egg; a fresh egg should be heavier than an old one. Finally, smell the egg – it should not have any ammonia or sulfur odors.