The Experiment:

1. Fleas are placed in a jar with a lid on it.
2. They try to jump out but keep hitting the lid.
3. Eventually, they learn to only jump as high as the lid allows.
4. Then, the lid is removed.

But guess what? Even without the lid, the fleas still only jump as high as they used to. They don’t try to escape.

🧠 What It Means:

This shows how:

• We can get used to limits (even if they're temporary).
• Past failure can create mental barriers.
• Even when those barriers are gone, we might still act like they're there.

💡 Real-Life Example:

A student keeps failing math and eventually thinks:

"I'm just not good at math."

Later, even with a better teacher or more help, they might not try—because they believe they’ll fail.

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🧩 The Lesson:

Just like the fleas, we sometimes hold ourselves back—not because we can't, but because we think we can't.

Sometimes the real lid is in your mind. ...