John Ball, an MIT radio astronomer who proposed the 'Zoo Hypothesis' in 1973.
The engine records his idea as one explanation for why we don't see alien life even if it exists.
He argued that advanced alien intelligences are all around us but deliberately stay hands-off, treating Earth as a kind of protected laboratory or quarantine zone they don't interfere with.
It matters as a named, serious attempt to explain the silence — the idea that we might be deliberately left alone and observed.