Almost 30 years after the Chernobyl nuclear disaster, which turned the area around the plant into a no-go zone, scientists are involved in a unique experiment in how nature copes with radiation.
Ukraine's ultra-nationalist Right Sector calls for the resignation of the country's interior minister following the deaths of two of its members in a shootout with police.
Greece may only represent a fraction of Europe's economy. But in everything else that can't be easily measured by the IMF or ECB, it represents to much more.
Fighting in Ukraine has killed more than 6,500 people. Filmmaker Patrick Wells travelled to south east Ukraine and got unprecedented access to forces on both sides of the ceasefire line.
A new UN report says one in every 122 people is either a refugee or seeking asylum. It says if this number of people were a country, it would be the world's 24th biggest.
Several firemen are feared to have been killed in a huge blaze at a fuel depot near Kiev.
US President Barack Obama promises to stand up to Russia over its Ukraine stance as world leaders gather for the G7 summit.
David Cameron plans to remind EU leaders that nearly 4 million British voters backed Ukip. He thinks some EU countries under-estimate the British desire to move from the status quo in Europe.