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The ability of the National Marine Park of Zakynthos (NMPZ) in Greece to protect an important sea turtle rookery will ultimately depend on the level of local support and involvement that it receives. Therefore, it is essential for environmental educators to generate among local inhabitants, starting at early ages, positive attitudes concerning the NMPZ. The authors designed a conservation educational module, with 15 activities, to affect knowledge and attitudes of elementary school students. The authors used a quasi-experimental design for summative evaluation with a pretest-posttest control and experimental group to measure the effects on 4 dependent variables: (a) knowledge, (b) understanding and concern, (c) locus of control, and (d) verbal commitment. The survey instrument comprised 32 items that the authors divided into 4 subscales that measured the dependent variables. In total, 332 elementary school students-162 girls and 170 boys, 11-13 years of age-from 21 classes and 15 schools participated. The results indicated a significant effect on knowledge (low pretest scores), but not on attitudes (high pretest scores). However, posttest correlations in the experimental group indicated that as knowledge level increased, students' (a) locus of control and (b) understanding and concern for the sea turtle issue became more defensible. The study thus provides a model for environmental educators to design conservation education modules to foster positive attitudes in managing endangered species in protected areas.

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We present models for utilizing blockchain and smart contract technology with the widely used OAuth 2.0 open authorization framework to provide delegated authorization for constrained IoT devices. The models involve different tradeoffs in terms of privacy, delay, and cost, while exploiting key advantages of blockchains and smart contracts. These include linking payments to authorization grants, immutably recording authorization information and policies in smart contracts, and offering resilience through the execution of smart contract code on all blockchain nodes.

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