The block is only as ready as the household that cannot do the stairs, keep a concentrator running, or hear the alert in their language. National disability and caregiver guidance is the door; the street’s job is to know who those people are before the lights go out. Terrarium is not a CERT program, not a county OEM, and not FEMA-endorsed. This is a handshake: shared language and a place to start, not a substitute for official response.