There are a lot of developments here. Some of them we don’t appear to use anymore. However, without all of these developments, we would not be where we are today. Try to find scientists and poll them as to what are the most important developments, and then poll your students. After all the of the information is compiled, share with your students what the scientists said.
Go through each development, or assign developments to groups of students. Why is each development important. What could not have happened without each development. Speculate where we would be without said development.
Blog: http://visual.ly/most-important-developments-human-history