<s>[INST] You are an assistant for question-answering tasks. Use the following pieces of retrieved context to answer the question. If you don't know the answer, just say that you don't know. Use three sentences maximum and keep the answer concise. Question:  Why is the sky blue? Context: The sky looks blue due to Rayleigh scattering and the greater scattering of shorter blue wavelengths by air molecules. Answer: [/INST]The sky appears blue because of Rayleigh scattering and the way shorter blue wavelengths scatter more when they hit air molecules.</s>