For anyone who's still a little fuzzy or confused by the enormity of the recent detection of gravitational waves by the LIGO facility, we've recorded a special podcast extra to shed some light on the impossibly complex world of General Relativity, interferometry detectors and gravitational waves themselves.

This podcast extra should explain in simple terms:

• What gravitational waves are
• Why they're so important
• How they were detected
• What this means for the future of physics & astronomy

With special thanks to LIGO, the National Science Foundation and Cardiff University's School of Physics and Astronomy.