Very nice short talk by Ze Frank with a simple little test: Are you human?

Ze guides us through aspects of the world that you will most likely recognise – and if you’re able to answer the questions you will be sure that you’re human.

Additionally, this talk is interesting from a speaking / presentation standpoint: What Ze Frank asks here are so called “closed questions” – a lot of them.

These work particularly well with large audiences; I recommend to include them into presentations in moderation, especially to start a discussion.