When the newspaper that journalist Emily Guendelsberger worked at closed, she decided to immerse herself in the type of work that makes up almost half of the American workforce: low-wage hourly jobs.

Guendelsberger traveled the US and worked at an Amazon warehouse, a call center, and a McDonald's. She found a structure that still needed human labor but demanded that those humans act like robots.

The following is an excerpt from her new book, "On the Clock: What Low-Wage Work Did to Me and How It Drives America Insane." S he describes the jobs she held and the pressure that she found in each.

Guendelsberger has worked at Philadelphia City Paper, the Onion's A.V. Club, Philadelphia Weekly, and the Philadelphia Daily News. She's contributed to the Philadelphia Inquirer, The Washington Post, Politico, and Vice.

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As a culture, we put far too much blind trust in data and technology.* Math and logic are beautiful languages. But it's so pretentious to pretend that they have adequate vocabulary to accurately describe a human, much less whether a human is happy or miserable. Our brains are the most complicated things in the known universe, with a hundred billion neurons making connections in a mind-bogglingly complex web that constantly changes. Our levels of technology aren't remotely close to being able to accurately describe that mess, and they won't be for a very long time.† Numbers and statistics just aren't up to communicating how something feels, even though that's often extremely important information.

That's why I decided to go experience this brave new world myself — so readers can get an idea of what the modern experience of low-wage work feels like. I went to work at an Amazon warehouse, a call center, and a McDonald's — three places that are fairly representative of the future of work in America. I spent between one and two months at each, and I worked them for real, with every ounce of my Dad-infused work ethic. And at each one, productivity-enforcing technology constantly corralled me and my coworkers into the weeds like a sheepdog snapping at a herd's heels.

Working in an Amazon warehouse outside Louisville, Kentucky, I walked up to 16 miles a day to keep up with the rate at which I was supposed to pick orders. A GPS-enabled scanner tracked my movements and constantly informed me how many seconds I had left to complete my task.

Read more: At a Google team off-site, we were asked to play a personality game that clearly revealed why it's so hard for women to reach the top

Working at a call center in western North Carolina, I was lectured about how using the bathroom too often is the same thing as stealing from the company, and had the minutes I spent in the bathroom tracked in a daily report sent to my supervisor.

Working at a McDonald's in downtown San Francisco, we were underscheduled to the point of a constant, never-ending line of customers — everyone worked at the frantic speed of those in-the-weeds waitresses of my youth all shift, nearly every shift.

I did plenty of research beforehand, and I'd heard crazy things about how stressful each job would be — each in its own special way, like Tolstoy's unhappy families. But at each of them, technology made it impossible to escape the weeds. And every time, my thorough research totally failed to prepare me for how dehumanizing the job felt.

We're at a strange point in the history of work. Automation of most jobs is only a decade or two away, and human workers increasingly have to compete with computers, algorithms, and robots that never get tired, or sick, or depressed, or need a day off.

On The Clock. Courtesy of Little, Brown and Company

Still, in industries that rely on skills that robots still aren't great at — fine motor control, speech and pattern recognition, empathy — the cheapest option is still low-wage human workers. And so many employers demand a workforce that can think, talk, feel, and pick stuff up like humans — but with as few needs outside of work as robots. They insist their workers amputate the messy human bits of themselves — family, hunger, thirst, emotions, the need to make rent, sickness, fatigue, boredom, depression, traffic — or at least keep them completely at bay.

I call these cyborg jobs — I have to have something to use as shorthand — and they make up an increasing slice of the American labor market, including most of the postrecession job growth. With labor power crippled by the last few decades of US policy, low-wage workers today have a strong, bordering-on-mandatory incentive to crush those unuseful human parts of themselves down to atomic size. And the pressure's starting to reach unmanageable levels.

Read more: I'm a wife and mother who works from home. My family acts like I don't have a job, and I'm tired of it.

How many cyborg jobs are there? It's hard to get good numbers on something that vague, but the statistic I find most convincing comes from a 2013 paper out of Oxford University. The authors tried to calculate how many and what kinds of jobs were so highly routinized that it'd be very easy to replace their human workers with computers or robots — that is, "occupations mainly consisting of tasks following well-defined procedures that can easily be performed by sophisticated algorithms."

They concluded these employed about 47% of the US workforce. So what does "in the weeds" mean to you?

To people with education and influence, "in the weeds" is something academic, about small, unimportant details. It's the footnotes. It's something you observe from the outside.

To everybody else, "in the weeds" is something you experience. It's something you feel. It's your life.

It's easy to make fun of that righteously indignant teenager at her first job. Readers to whom this all seems obvious may find the adult me just as naive. I was shocked by the pain-medication vending machines at Amazon, for example, while people familiar with warehousing work might roll their eyes. That's fine. For you, my book may be useful as an exploration of how much better people have it on the other side. Because every white-collar person I've mentioned those vending machines to was just as horrified — and they wouldn't put up with any of this for a second.

* Nothing wrong with those things, of course! By the time I started scooping ice cream, I'd maxed out the math classes at my high school, and I've always found the tidiness of problem sets to be a bit of a relief compared to the chaos of things like writing and makeouts and . . . you know, life.

† I'm married to a neuroscientist, and the number of things about the brain where the scientific consensus is still ¯\_(ツ)_/¯ is astonishing.

Excerpted from ON THE CLOCK. Copyright © 2019 by Emily Guendelsberger. Used with permission of Little, Brown and Company, New York. All rights reserved.

This story was originally published on Business Insider August 9, 2019.