I generally agree that calls can be the kryptonite of productivity. However, the single most IQ-enhancing activity I do is customer calls. It's insan… - Guillermo Rauch

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I generally agree that calls can be the kryptonite of productivity. However, the single most IQ-enhancing activity I do is customer calls. It's insane how much you can learn in 15 minutes of listening to a customer's vivid accounts of pain or watching them use your product in realtime