Beakman explains what a microscope does and then dresses up like Zacharias Janssen, the compound microscope inventor. He shows how Leewenhoek basically created a magnifying glass but Janssen expanded upon it by adding the second lense to make a compound microscope. Beakman then shows a variety of slide samples under the microscope and explains it's an important scientific tool.
Guy helps the family of The Croods to walk on some pointy plants due to his invention (the shoes), a tool that they will use for the first time in their lives.