Prime Minister Costas Karamanlis visits Evian, France, to attend the World Policy Conference. To tomorrow.

The Education Ministry is hosting a conference on “Animals and Children: Residents of the Same Planet,” starting at 10 a.m. at the ministry. For more information, log on to www.ypepth.gr.

The National Observatory of Athens holds a conference on “Watching and Protecting the Earth from Space: Experiences and Perspectives,” starting at 9 a.m. at the Goulandris Natural History Museum. For further information, call 210.810.9182 or log on to www.space.noa.gr.

The 15th Biennial Defendory 2008 exhibition of Conventional Systems for National Defense on Land-Sea-Air opens on the site of the old Athens airport at Hellenikon. The exhibition is hosted by the American-Hellenic Chamber of Commerce and the US Embassy and will run through Saturday. For further information, call 210.699.3559 or log on to www.amcham.gr.

Workers at public enterprises (Hellenic Post, Olympic Airlines, OTE telecom, Hellenic Railways Organization, Public Power Corporation) will stage a 24-hour strike to protest privatization plans.

The eighth international Hydrogeological conference on “Water and the Environment” begins at the Athens Imperial Hotel. To Friday. For further details, call 210.727.4406 or log on to www.iah-hellas.geol.uoa.gr/.

The Institute of Electrical and Electronics Engineers in collaboration with the National Technical University of Athens host the eighth international conference on “BioInformatics and BioEngineering,” to be held at the Royal Olympic Hotel in Plaka. To Friday. For further details, log on to www.bibe2008.org.

The Greek National Committee of the International Dairy Federation (IDF) is hosting the first panhellenic scientific conference on “Milk and its By-products,” at the Athens Imperial Hotel. To Friday. For details, call 210.529.4651 or log on to www.aua.gr.