This video recreates a famous experiment in which Galileo, an Italian scientist, dropped two objects from the Leaning tower of Pisa in 1589. He explains that he did the experiment to show the pull of gravity on an object is the same, regardless of their different weights. He explains that force is a push or pull on an object. He goes on to dispute Aristotle’s theory of force, and introduces the concept of posing a scientific question (hypothesizing) before experimenting. Teacher notes: As a starter to introduce a practical science activity, you could write a simple quiz to encourage students to capture the keywords shown in the video. Students can write their own definitions of these words using the internet or science dictionaries to improve their scientific vocabularies. To consolidate their knowledge, you could get students to make booklets that include key information about the work of Galileo Galilei. They could define the keywords featured in the video and find five or more additional pieces of information about the work of the scientist using books, encyclopedias or the internet.