In the world of _______ , there are amazing detectives known as _______ . They uncover ancient treasures like tools and bones to understand the lives of early humans, or _______ , who lived during _______ , a time without written records. These discoveries become like time machines, taking us back to the past. _______ , like diaries and letters, provide direct insights into historical events from those who experienced them. But sometimes, to get a broader picture, we also rely on _______ , such as books and articles written by historians. And occasionally, we stumble upon a rare gem, a _______ like a beautifully crafted piece of pottery or an ancient coin, shedding light on how people once lived. Archaeologists, through their work, connect the dots between _______ and recorded _______ , helping us piece together the puzzle of our history.