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

[Bretrick]

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

[spitfire]

Its more likely the message would read ~"^*=!#!! and we would say, what the Fu_ks that all about?

[Primus1]

More likely, “ you might be ready for us, but we’re not ready for you “…