PAOLA — This week is the National 4-H Science Experiment Week. Miami County Extension agent Carla Hightower said students can have a blast by making bio-fuel. Any student from 8 to 12 can perform a variety of scientific experiments, including making bio-fuel, she said. Science Blast will be 4 to 5:30 Wednesday afternoon at the Miami County Extension office and is open to any youngster, she said.