Learning objective:

To help student to understand that scientific knowledge is based on sharing and verifying information.

Tasks:

The main task is to promote activities based on small group discussions,  which are followed up in a shared whole class discussion.

An example of this is the general structure of Unit Blood Donation

Also, any activity based on listening and discussing scientific-type conferences can help because the teachers can work with the students in a way that make him/her understand the students views.