https://www.selleckchem.com/pr....oducts/9-cis-retinoi
The 21st century has seen rapid enrollment in online courses and environmental and biological determinates, such as COVID-19, that challenge how universities respond to education. However, this "new way of doing things" has empirical support from the past. Skinner (1968) laid out a science of teaching derived from operant conditioning principles and provided methods for adopting programmed instruction into what he termed a "teaching machine." This series of investigations evaluated the validity of programmed instruction in o
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