This week, Joe O'Leary, senior researcher and head of special projects at Full Fact, tells us what makes a great fact checker - and why it's so important.

To find out more about training as a journalist with the NCTJ, go to www.nctj.com or email info@nctj.com.

We'll be posting a new summer school video every Monday. Don't forget to subscribe to our channel for updates.

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