One of my favorite labs to do during the fist few days of school is the Fortune Fish Lab. It allows students to observe a phenomenon, then design and conduct an experiment. It is a also an effective formative assessment to see if the students understand experimental design. If you enjoy this lab, check out one of my favorite books If You Build It; They Will Learn by Bruce Yancy.
I have been a science teacher in Arizona for over 20 years. I started this website to help both new & continuing teachers. I remember walking into my first classroom with no books, no curriculum, no support - I wanted to build a site that would help support science teachers.