Why did Earth's first radio message to alien civilizations leave out half of humanity?
Briefly

The 1974 Arecibo message, a binary code depicting humanity’s essence, aimed to showcase human knowledge but raises questions about our existence and legacy in the cosmos.
Being a mix of scientific data and human identity, the Arecibo message serves as an example of how we communicate who we are, revealing our aspirations for connection beyond Earth.
Television signals and other electronic communications from Earth continue to disperse into space, highlighting an ongoing endeavor to reach out to potential extraterrestrial civilizations.
Five decades after the first message, the lack of replies invites contemplation on what it means to send out signals into the void and reflect on our place in the universe.
Read at Nature
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