every time we encounter a link, our brains must make a split-second decision about whether to click on it. These decisions are so frequent and tiny that we often don’t even notice that they’re happening. But we can’t make split-second decisions and think deeply at the same time – the two acts use different and competing brain regions. Every decision, no matter how tiny or subconscious, pulls our attention away from what we are reading. This in turn makes it harder to absorb the content of what we’re reading – let alone to think about it critically, or remember it later. Second, unlike a dog
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