PILES of scattered seashells at Kenjeran beach in Surabaya, East Java, attracted the attention of the three youths. Soon they found themselves seriously engrossed, forgetting their reason they came to the beach—to relax between studies. They were convinced that the seashells were not destined to merely contaminate the beach. “They must be of some use,” said Helda Yulia Sari, 21, a student majoring in civil engineering at the November 11 Tec