Have you ever wondered why chicken eggs can be different colors? While most eggs are white or brown, they also come in colors like cream, pink, blue and green. In addition — and this is no “yolk” — ...

A 13,000‑year‑old tool from a cave in central Germany has turned out to be far more than a simple piece of Paleolithic gear. Under a microscope, its surface revealed a vivid blue that should not have ...