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<a href="https://www.dcu.ie/people/oisin-creaner">Assistant Professor Oisin Creaner, School of Physical Sciences</a>, explains what an exoplanet is, and why it can be challenging to find new ones. </div>

8: Why is cancer so hard to treat?

Scientists from Dublin City University answer scientific questions in ordinary language in two minutes. If you have a question for us, get in touch with the podcast producer, Seán Duke, email: sean.duke@dcu.ie