We read the book What is Science? by Rebecca Kai Dotlich.
Then we charted things a scientist can do. You can find the chart pieces here.
Scientists can perform experiments. This is a Kool-aid/baking soda experiment from Kathryn's unit. There are recording sheets for each station, so you can talk about how scientists observe and record their observations too.
Scientists observe things. I had my students use magnifying glasses to closely examine shells and look for their properties. This is a great tool lesson that you can do at any point in the year. Kathryn's unit has a great recording sheet with mini pictures that the kids can look at with magnifying glasses and then match to the larger picture.
Scientists can measure things. If I were to do this activity again, I would use one type of counter and one object. I put out too many objects and had to take some back. This is a great station and recording sheet for when you teach about matter and mass.
Scientists discover. My students explored how much rice each cup could hold and then compared how much each cup held to see which one held the most. This is a great activity and recording sheet for a lesson on capacity.
Scientists perform tests. Students explored how many drops of water would fit on a penny. Shelly had her students wear aprons, gloves, and goggles at the different stations, so I threw in some safety goggles here to teach how scientists have special equipment to keep them safe.
Scientists can use tools. This station was a tool/toy sort. My students had a hard time finishing this station because of the cutting. If I did this over I would pre-cut the pictures using a paper cutter. Then I would sort them and make a different basket for each picture so kids only had to glue them or I would pre-cut them and have single sets in a baggie for kids to use. If you do this as an individual lesson, time should not be factor.