1. A researcher has 20 rats in a large cage, and he wants to assign them to two groups. He puts the first rat he catches in the experimental group, the second into the control group, and so on. Why is...

1. A researcher has 20 rats in a large cage, and he wants to assign them to two groups. He puts the first rat he catches in the experimental group, the second into the control group, and so on. Why is this bad science?

2. Do learning principles have anything to contribute to major social problems, such as pollution?