These Open & Go elective units are created by Happy Days Homeschooling in Australia for US homeschool families who want meaningful, hands-on learning without hours of planning. Each project-based unit can be used as an enrichment activity, interest-led study, portfolio sample, or part of a wider homeschool curriculum, with connections to NGSS, Common Core literacy, STEM, social studies, career readiness, and 21st-century skills.