Blindness is one of the most terrible conditions that human beings can experience, since those of us who can see depend on sight for almost all of our daily activities. Therefore, aids for the blind have always been given special consideration. These aids include texts written in Braille, Braille printers, electronic magnifying glasses, mobility aids, books and other texts read aloud, talking watches, and many more. A 2008 article published in Communications of the ACM summarizes the state of these aids at that time. In particular, Chieko Asakawa has been working in the field of mobility aids for the blind for years, having published at least ten articles on the subject between 1998 and 2019.
Popular Science
Manuel Alfonseca
Collection of my brief articles on popular science. Most have also been published in Spanish.
Full list at: https://manuelalfonseca.acta.es/docs/papersd.htm.
Thursday, November 13, 2025
Thursday, November 6, 2025
Christianity and Anti-Christianity in Fantasy and Science Fiction
A new book of mine has just been released with the
same title as this post. It was published in Spanish by CEU Ediciones, and in
English by Amazon.
There is a fairly widespread idea that we shouldn’t
speak about Christian literature as a literary genre, except perhaps in
fantasy, where the Christian character of such famous literary works as J.R.R.
Tolkien's The Lord of the Rings or C.S. Lewis's The Chronicles of Narnia cannot be denied. In science fiction, the matter
is not so clear. However, no one doubts that atheist literature does exist.
My book starts from the premise that an evident Christian
literature exists in both genres, and demonstrates this by analyzing a series
of authors and literary works, without neglecting anti-Christian literature, to
which almost a third of the work is dedicated.
My predilection for fantasy and science fiction has been clear in this blog, given that over almost 12 years I've dedicated 34 posts to those two genres in literature and film; in other words, more than 6% of the posts.
Thursday, October 30, 2025
127 Years of The War of the Worlds
In October 30, 1988, the Sunday supplement of La Vanguardia (a major Spanish newspaper) published an article I had written, commemorating the 90th anniversary of the publication as a book of Herbert George Wells’s novel The War of the Worlds. (It had been published in instalments the previous year). That year also marked a half-century after Orson Welles’s radio adaptation of that novel, which caused panic in part of the United States, because many people didn’t realize it was an adaptation of a novel and thought that the Martians were invading Earth.
This year marks the 127th anniversary of the publication of this novel, perhaps the best-known of works of H.G. Wells. A generation after Jules Verne, Wells is the second great precursor of a literary genre (science fiction) that enjoyed enormous expansion in the 20th century. In light of this anniversary, I wonder: Why do these celebrations always take place when the number of years is a multiple of 25? Why can't the 127th anniversary be celebrated?
Thursday, October 23, 2025
William Crookes, Unorthodox Scientist
| William Crookes |
One of the most surprising scientific figures of
the second half of the 19th century in England was William Crookes (1832-1919),
whose scientific career was spectacular, although his activities related to
spiritualism, which was then in vogue in England, were also widely known.
Here's a list of Crookes's scientific achievements:
· An expert in spectroscopy, in 1861 he discovered a new chemical element, thallium, number 81 on the periodic table, located in the same column as boron, aluminum, gallium, and indium, whose chemical properties it resembles. Thallium was discovered simultaneously and independently by the French chemist Claude-Auguste Lamy, who is considered a co-discoverer, although it was Crookes who named it, from the Greek word θαλλός, meaning green twig, in reference to the green line in its spectrum that helped him discover it. This discovery led to his appointment as a Fellow of the Royal Society in 1863.
Thursday, October 16, 2025
Do people with Down Syndrome have a right to life?
A post I published in this blog in 2017 ended with this paragraph:
Why are
human beings conceived with trisomy of chromosome 21 (Down syndrome) denied the
right to life, to the point that, in many Western countries, in practice they
are not allowed to be born?
In another post, published in 2015, during the first year of this blog's existence, I calculated the probability that the triple and quadruple screening tests, then in use to detect trisomy of chromosome 21 (the cause of Down syndrome), would produce false positives. The conclusion was this:
Thursday, October 9, 2025
Science fiction and the multiverse
In several previous posts (see one here), I have argued that multiverse theories are not science, as they cannot be proven false, but rather science fiction, purely imaginative creations. Further proof of this is that the idea of the multiverse did not originally arise from science, but from science fiction. Some of my reading this summer has helped me complete the proofs for this assertion.
The most common form of the multiverse, the M-theory multiverse, appeared for the first time in science fiction literature in a short story by Clifford Simak, published in 1939, which the author later developed into a novel, Cosmic Engineers, published in 1950. In this novel, the protagonists must confront the invasion of our universe by malevolent intelligent beings from another universe, who want to destroy us. To defend themselves, Earthlings establish an alliance with a civilization made up of artificial intelligences created by long-gone extraterrestrial beings, who warn them of the threat from the other universe.
Thursday, October 2, 2025
Humanoid robots at home?
Technological companies are investing huge amounts of money to develop humanoid robots for use in the home. One such company, Figure AI, claims that the introduction of humanoid robots into the home will revolutionize elder care and the performance of routine household tasks. Goldman Sachs predicts that the humanoid robot market could be worth $38 billion by 2035.
In an article published in IEEE Spectrum, Maya Cakmak of the Paul G. Allen School of Computer Science & Engineering at the University of Washington describes a study conducted with students on the acceptance of the introduction of humanoid robots in the home. Their survey concluded that people generally prefer special purpose robots over humanoids. They see special-purpose robots as safer, more private, and ultimately more comfortable to have in their homes… a Roomba for cleaning, a medication dispenser for pills, a stairlift for stairs… Humanoids were described as bulky and unnecessary, while specialized robots were seen as less intrusive and more discreet.



