why is 67 funny

The reason "why is" is incomplete, but based on common usage, it often starts a question asking for a cause or explanation of something. If the inquiry is "Why is the sky blue?" (a common "why is" question), the answer is that the sky appears blue because of a phenomenon called Rayleigh scattering. When sunlight passes through Earth's atmosphere, the shorter wavelengths of light (blue and violet) are scattered in all directions by the air molecules more than the longer wavelengths (like red). Our eyes are more sensitive to blue light and less to violet, so the sky looks blue during the day. If the user's question "why is" is referring to something else, please clarify the full question or context for a precise answer. Here is an explanation for "Why is the sky blue?" for context: The sky is blue due to the way Earth's atmosphere scatters sunlight. The shorter wavelengths (blue) are scattered more than the longer wavelengths (red) by the molecules in the atmosphere, making the sky look blue to our eyes.