top of page

Marcel Ruiz Mejías, PhD
Scientific, medical, and educational writer and translator
Welcome to the blog
WE ARE KNOWMADS
A blog for liquid navigators
Crossing the limits of humankind
A while ago, I went swing dancing. I must admit it is not one of my strengths, given that the dance events are often at night, and at this time, my capacity to execute coordinated movements is, at most, that of a wooden doll.
How could I enhance my dancing skills? Am I condemned to dance badly all my life, just...
marcelruizmejias
Aug 314 min read
What’s behind intuition? Busting the myth about ‘activating’ it
"I would like to point out that my intuitive idea about intuition relies on the fact that it is about experience. For example, you know that your brother is in love with comic books.
You read it while sipping a glass of orange juice in your bed.
Balls the cat jumps out of the bed and spills the orange juice over your pyjama and the comic book. Then you <em>intuitively</em> know you...
marcelruizmejias
Nov 12, 20244 min read
The Neuroselling Era
In the era of post-pandemic-and-other-disasters pricing inflation, in which -sorry for remembering- we are almost all involved, neuroscience users are not missing the part of the cake.
Neuromarketing thrived in the last 20 years by promising tools and information that would help customer-oriented coverage of needs. So, what’s the thing behind it? And what’s my take on it - if anybody cares?
marcelruizmejias
Aug 29, 20242 min read


Health is often overrated
Are you healthy? Do you have a ‘complete’ state of health? Please, be honest… Why the WHO defined ‘health’ as a complete physical, mental and social well-being and not merely the abse...
marcelruizmejias
Aug 1, 20243 min read


Chocolate Ice Cream
Usually you have an idea, you take a decision that you consider appropriate, and you put it into action.
Typically, more often than not, the move goes wrong. You screw up. You spill it all over, sh*! happens, and you make a mess. Damn, it seemed so easy...
marcelruizmejias
Jul 26, 20242 min read
What a weekend, man
I don’t know if you have experienced this situation in the past.
This story begins with something really unusual: a whiskey shot.
marcelruizmejias
May 6, 20243 min read
One second of life (or two)
At the intersection between psychiatry and oncology, there is a branch of clinical practice known as psycho-oncology. It involves health professionals from medicine, psychology, nursing, and many others.
You may well have had the opportunity to have met or been treated by one of them, just because cancer and mental health go hand i...
marcelruizmejias
Apr 5, 20243 min read
Spaces for brain restoration: reserve and resilience
Why do some people who lived through war, abuse or terrible loss overcome these situations, becoming stronger? In physics, a material is resilient when deformed by a force, recovering after its original shape. In recent years, neuroscientists have realized that the brain behaves similarly.
For different reasons, our brain can reac...
marcelruizmejias
Feb 24, 20244 min read
On brain balance, overthinking, attention, and a basin
For quite a while I have been thinking about different ideas, such as the balance of the brain, the thoughts that go round and round and the capacity to pay attention. A few days ago I woke up with a need to write about all this. Right after sending the kids to school, I started typing on the computer to see if anything made sense.
marcelruizmejias
Jan 26, 20245 min read
Dopamine, learning and motivation: Why does this molecule drive our life forward?
Remember Pavlov and his dogs? This researcher, who left theology for medicine and physiology, conducted repeated pairings in which an initially neutral stimulus, such as a bell, accompanied the dogs’ food. He observed that after such training, the animals salivated at the sound of the bell, even if presented with no food. Condition...
marcelruizmejias
Nov 7, 20239 min read


Substance X: history of the discovery of insulin
Leonard Thompson was the first human being, a 14-year-old boy, to receive a life-saving insulin injection on January 23, 1922. Leonard was diagnosed with nowadays type I diabetes, which was fatal in a short time. He had already received a first injection on the 11th, which had a limited effect. But the image of a little boy gettin...
marcelruizmejias
Sep 15, 20236 min read
We have a washing machine in the brain
One of the best-known methods of torture is sleep deprivation. The consequences are familiar to all of us who are parents. You wake up the next day thinking that nothing good can happen that day. You drag yourself down to your daily chores, with one of the biggest downfalls being the possibility of two or three such nights of bullfighting.
marcelruizmejias
Aug 14, 20233 min read
When creating enters the body: a look to the embodiment of creativity
When thinking about creating a bunch of neuroscientific evidence pointing to the brain describes it as a mainly cognitive process. However, a broader view coming from interdisciplinary approaches shows it may be a human capability that we experience with our whole body.
marcelruizmejias
Apr 17, 20236 min read
On cyborgs, neurotechnology and neurorights
I don't feel like I wear technology. I don't feel like I wear technology. I feel like I am technology”. This is how Neil Harbisson expressed a decade ago, recognized as humanity's first cyborg, his relationship with his sensor implanted in a bone in his head. He was born with a vision defect that did not allow him to appreciate colours and decided to correct this through an antenna implanted in his head through which he can receive auditory f...
marcelruizmejias
May 28, 20198 min read
bottom of page