Kathriona meets the researchers unlocking the mysteries of Ireland's vanishing lakes, Aoibhinn reveals how our past may provide clues to help us better manage drought… and Jonathan considers a future of climate extremes, where protection of and resilience in our groundwater resources will be even more essential…

We meet the Irish researchers playing a key role in the fightback against Covid-19. Kathriona meets the researchers who are working to track the spread of the disease and identify genetic changes that may impact on treatments and vaccine development.  Jonathan highlights how Ireland's world-leading TILDA study is ideally positioned to examine and better understand the impact of the pandemic and lockdown measures on older people.  And of course, despite the current negative associations, not all viruses are bad! Kathriona investigates the most abundant and deadly viruses on the planet… and how they're being used to tackle infection and harmful bacteria in food processes.