What scientific discovery would change the course of humanity overnight if it was discovered?

We received a decipherable message from deep space saying, "Are you ready for us"?

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chrisCA · M

I agree. First contact.

Gusman · 61-69, M

@chrisCA That would rock the world. The message was broadcast over all frequencies operating throughout the world so every person with a radio, TV or any other receiving device got the message. No cover up permitted by Governments.