A nice way to end a lesson dealing with open/opinion based questions like “do aliens exist?” or “should 16-year-olds get the vote?”
Write two opposite statements on pieces of paper – e.g. “aliens definitely exist” and “aliens definitely do not exist” and get two students to hold them up, one at either side of the front of the class.
Then invite students to come up one at a time and stand somewhere on the “continuum” between the two statements – indicating to what extent they agree with the statements. You can ask students to justify why they are standing where they are.
Depending on time and how many people want to express their opinion, you might even get the whole class standing along the continuum (though by that stage people’s positions may also be heavily swayed by where their friends are…)