Shannon showed in 1956 that feedback does not increase the capacity of memoryless point-to-point channels. Subsequent research revealed that feedback does increase the capacity of memoryless multiple-access channels, by enabling the transmitters to cooperate. However, the gains in practical scenarios are typically very small, especially relative to the amount of feedback effort. Thus, feedback in communication systems is typically used for channel prediction by exploiting channel memory. In this talk, we discuss another role of feedback in memoryless networks: learning about the past side information at receivers in broadcast scenarios. We argue that this way of using feedback is more effective than using it to induce cooperation between transmitters. 