Use a magnet to prove that there really is iron in your breakfast cereal. Use this science experiment to discover the different iron content of cereals. Science Experiment STEM Activities Science for Kids At Home Science
This website has a ton of great ideas! The image is of the journal that she has them keep of information they learn about inventors. She also had her first graders experiment with phones they made from tin cans, which I think is a fun, authentic activity.
Telephony has evolved from party line service to business necessity to the ubiquitous presence of the smart phone. This technological tour-de-force is explored in this infographic. Via: Business Phone Service Phone.