add more examples

src/routes/+page.svelte

@@ -18,9 +18,11 @@
     let pendingRequest: string | null = null;
 
     const promptExamples = [
-        "What is the capital of France?",
         "Tell me a story about a cat.",
         "Write a poem about the ocean.",
+        "What is refraction?",
+        "Explain thermal conductivity",
+        "What is Newton's first law of motion?",
     ]
 
     async function setPrompt(prompt: string) {