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This week's programme聽opens with Oliver Knowles, from Bangor, who recalls for Science Cafe, the day he was caught up in the recent, devastating earthquake in Nepal.

We've read much about this terrible event in recent weeks and watched the heartbreaking television footage. In Science Cafe we try to shed some light on why earthquakes happen. And they do, on a regular basis around the world. Adam Walton talks to Wales chief geologist, David Schofield, about聽seismic movement.聽There are聽consistent, minor quakes in the UK and Snowdonia聽is聽a 'hot spot'.

It's important to collect data on all quakes and at Cardiff Museum, you can watch a seismograph in action. Dr Jana Horek explains to Adam, why cows and hailstorms can effect the readings.聽

The vast majority of earthquakes are barely聽felt, but major ones in聽developing countries with poor infrastructure are devastating. Adam talks to Dr Steve Bloomer,聽whose work at Teeside University is enabling quake-prone developing countries to聽construct safer聽buildings.

Most of the buildings in the Nepalese village where Oliver Knowles was staying were destroyed in the April earthquake.聽Oliver is now raising聽money to rebuild a school there and if you want to contribute you can get in touch with him at oliver@gorad.co.uk听听听听