How Did Ancient Emperors Keep Their Secrets?

Imagine you're a king, and you have super important secrets that could change the world, like where your treasure is or who your real enemy is. To keep those secrets safe, you might use special people called messengers or even write messages in special invisible ink so no one else can read them. Sometimes, you would lock up your most trusted friends and feed them only a little food to make sure they wouldn't try to betray you. It’s like having a secret club that only the best members can join!