A boy casts a shadow on a sunshade as he stands next to his father on a beach in Vina del Mar city, 85 miles (137 km) northwest of Santiago, December 28, 2006. The Chilean coasts are experiencing a heat wave, with radiation rising to dangerous levels. Local authorities called on the population to take care to avoid lengthy sun exposure during the summer season. REUTERS/Eliseo Fernandez (CHILE)