The following is a condensed version of an article originally published on March 6, 2017.
It is reproduced here as a table of contents.
 The Brain is a Strange Machine The first time I met the neurology consultant at her office in Manhattan, she had been waiting a while for me to show up.
She’d been looking for someone to do a series of experiments, one of which involved injecting me with the same medication she’d been using for months on end.
I knew what she was looking for: a drug that would help her to improve my memory.
So she did what she does best: She injected me with it.
I was hooked.
She and her team had been studying me since 2012, when they started to test my ability to remember words in an attempt to figure out why I was so prone to forgetting certain words.
By the time I was done, the research had produced a remarkable, if somewhat surprising, result: I was not only less likely to be unable to remember the words I had just heard, but also much more likely to remember them incorrectly.
For instance, the number of words I knew, but couldn’t remember was twice as large as the number I had known but was correct in.
(A common mistake people make when trying to remember something, they say, is to write down the wrong number.
But the number you write down is a rough estimate, because your brain is unable to process it accurately.)
It turns out that, just like you can’t forget a number if it’s a power of two, your brain can’t remember a word unless it’s an approximation of the number.
And even when we’re able to do it, we’re not always able to remember it accurately.
For example, my memory for a specific number is only about half what it is when I’m just trying to do something else, like recall a memory I’d been studying.
But when I was actually doing something, like recalling a memory, my accuracy was actually much higher.
To understand why this is, it’s important to remember that our brains use lots of different mechanisms to help us to remember things.
And the different mechanisms all work differently when we are trying to recall something.
For one thing, the brain works by comparing two pictures or two words that are different, and then it tries to find similarities in those two images or words.
So if you’re comparing the picture of my face to the one I’ve been picturing, the same brain would recognize that my face is more similar to that picture than it is to another picture, because it has a similar perspective.
This comparison mechanism can work to help you remember information if you remember two images that are similar.
But if you are trying not to remember two different pictures, the memory you have may not be as accurate as you’d like.
And this problem is why, when people are asked to identify their memories, it is often much more difficult to remember those memories correctly than it would be if they had simply looked at the two pictures that were being compared.
Another important part of our brain’s memory system is the word-processing system.
This is the part of the brain that actually produces the memories we actually remember.
When we’re looking at images, we use the word “yes,” which is the same as “yes, I remember that,” and “no, I don’t.”
When we are recalling information, we also use the words “yes” and “yes.”
When you are looking at two pictures, you’re using the word, “yes!” but when you are recalling a word, you are using the words, “no,” “yes no.”
These words can work in the same way as the word for “yes”—they are similar words, but you’re not sure whether the word is the correct one.
And when we use words like “yes”, “no”, and “not” when trying, we are also using words that can produce similar memories.
In other words, when we try to remember a memory correctly, the words we are using will be similar.
In our brains, the word you are writing down has a different meaning when you read it than it does when you type it in.
For this reason, it can be difficult for people to remember their words correctly.
And that’s why, as you read this, you should be careful to use the same words that you use when trying and remembering information.
 You’ll Be Back There Once the experiment was over, the consultant left.
I’d had enough.
I had forgotten about the experiments and was ready to get back to my normal routine of getting up, going to work, and sleeping.
But it was the first time since then that I’d tried to do that, so I didn’t want to give up.
But then I remembered the drugs that the consultant had been injecting me for months.
One of the things I’d