Mona Lisa Has Charcoal Preparatory Sketch, French Expert Says

Mona Lisa Foundation's Vice President David Feldman moves Leonardo da Vinci's "Earlier Mona Lisa" painting into its viewing enclosure ahead of its exhibition at The Arts House in Singapore December 12, 2014. REUTERS/Edgar Su
Mona Lisa Foundation's Vice President David Feldman moves Leonardo da Vinci's "Earlier Mona Lisa" painting into its viewing enclosure ahead of its exhibition at The Arts House in Singapore December 12, 2014. REUTERS/Edgar Su
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Mona Lisa Has Charcoal Preparatory Sketch, French Expert Says

Mona Lisa Foundation's Vice President David Feldman moves Leonardo da Vinci's "Earlier Mona Lisa" painting into its viewing enclosure ahead of its exhibition at The Arts House in Singapore December 12, 2014. REUTERS/Edgar Su
Mona Lisa Foundation's Vice President David Feldman moves Leonardo da Vinci's "Earlier Mona Lisa" painting into its viewing enclosure ahead of its exhibition at The Arts House in Singapore December 12, 2014. REUTERS/Edgar Su

The Mona Lisa by Leonardo da Vinci has confused the world for centuries, and it still has more hidden secrets. Debates over this famous drawing, the identity of the woman with the wide smile, and the possibility of finding other preparatory sketches for it are incessant.

Reuters reported on Saturday that a French art expert believes a charcoal drawing kept in a collection for more than 150 years may be a preparatory sketch made by Leonardo da Vinci of the Mona Lisa.

The black-and-white drawing of a woman, nude from the waist up, known as the “Monna Vanna”, was previously attributed to Leonardo’s studio, suggesting it was done in his style by a pupil or follower, not by the master himself.

But after preliminary tests at the Louvre Museum, experts believe the sketch may well have been drawn by Leonardo.

The Museum’s curator Mathieu Deldicque said among the signs are the fact the drawing was made during the same period as the Mona Lisa, the paper is from the same region of Italy, and the technique is very similar to that of the Mona Lisa.

Deldicque told reporters: “We know the drawing was made during the lifetime of Leonardo da Vinci, we know that the paper was made in Italy, between Venice and Florence, and the third discovery is the high quality of this drawing in the face of the Monna Vanna and in her arms. That’s very interesting because the arms are the same as the Mona Lisa‘s.”

Leonardo, who lived from 1452 to 1519, was an engineer, scientist, inventor and sculptor, as well as one of the finest artists of the Italian Renaissance.

He painted the Mona Lisa, also known as La Gioconda and regarded as the world’s most valuable artwork, at the beginning of the 16th century. It is believed to depict Lisa Gherardini, the wife of a successful merchant.

The charcoal portrait, in which the woman is holding a similar pose to the Mona Lisa but with her body more side-on and her head turned further over her left shoulder, has been held in a collection at the Conde Museum at the Palace of Chantilly, north of Paris, since 1862.

Deldicque explained that while it was exciting to think the charcoal drawing was created by Leonardo, there were more tests to be done. He added: “We have one more month of analysis and then a very slow process of history of art with a collection of analysts and advice by specialists,”
It is possible that process will determine that the authorship is the same. But it may also be inconclusive, he noted, adding: “Maybe the mystery will remain.”



Deep-sea Fish Break the Mold with Novel Visual System

A close-up showing the shiny silver-green photophores (light organs) on the lower head of the deep-sea fish Maurolicus muelleri from the Red Sea, seen in this photograph released on February 11, 2026. Dr. Wen-Sung Chung/Handout via REUTERS
A close-up showing the shiny silver-green photophores (light organs) on the lower head of the deep-sea fish Maurolicus muelleri from the Red Sea, seen in this photograph released on February 11, 2026. Dr. Wen-Sung Chung/Handout via REUTERS
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Deep-sea Fish Break the Mold with Novel Visual System

A close-up showing the shiny silver-green photophores (light organs) on the lower head of the deep-sea fish Maurolicus muelleri from the Red Sea, seen in this photograph released on February 11, 2026. Dr. Wen-Sung Chung/Handout via REUTERS
A close-up showing the shiny silver-green photophores (light organs) on the lower head of the deep-sea fish Maurolicus muelleri from the Red Sea, seen in this photograph released on February 11, 2026. Dr. Wen-Sung Chung/Handout via REUTERS

For more than a century, biology textbooks have stated that vision among vertebrates - people included - is built from two clearly defined cell types: rods for processing dim light and cones for bright light and color. New research involving deep-sea fish shows this tidy division is, in reality, not so tidy.

Scientists have identified a new type of visual cell in deep-sea fish that blends the shape and form of rods with the molecular machinery and genes of cones. This hybrid type of cell, adapted for sight in gloomy light conditions, was found in larvae of three deep-sea fish species in the Red Sea, Reuters reported.

The species studied were: a hatchetfish, with the scientific name Maurolicus mucronatus; a lightfish, named Vinciguerria mabahiss; and a lanternfish, named Benthosema pterotum. The hatchetfish retained the hybrid cells throughout its life. The other two shifted to the usual rod-cone dichotomy in adulthood.

All three are small, with adults measuring roughly 1-3 inches (3-7 cm) long and the larvae much littler. They inhabit a marine realm of twilight conditions, with sunlight struggling to penetrate into the watery depths.

The vertebrate retina, a sensory membrane at the back of the eye that detects light and converts it into signals to the brain, possesses two main types of light-sensitive visual cells, called photoreceptors. They are named for their shape: rods and cones.

"The rods and cones slowly change position inside the retina when moving between dim and bright conditions, which is why our eyes take time to adjust when we flick on the light switch on our way to the restroom at night," said Lily Fogg, a postdoctoral researcher in marine biology at the University of Helsinki in Finland and lead author of the research published in the journal Science Advances.

"We found that, as larvae, these deep-sea fish mostly use a mix-and-match type of hybrid photoreceptor. These cells look like rods - long, cylindrical and optimized to catch as many light particles - photons - as possible. But they use the molecular machinery of cones, switching on genes usually found only in cones," Fogg said.

The researchers examined the retinas of fish larvae caught at depths from 65 to 650 feet (20 to 200 meters). In the type of dim environment they inhabit, rod and cone cells both are usually engaged in the vertebrate retina, but neither works very well. These fish display an evolutionary remedy.

"Our results challenge the longstanding idea that rods and cones are two fixed, clearly separated cell types. Instead, we show that photoreceptors can blend structural and molecular features in unexpected ways. This suggests that vertebrate visual systems are more flexible and evolutionarily adaptable than previously thought," Fogg said.

"It is a very cool finding that shows that biology does not fit neatly into boxes," said study senior author Fabio Cortesi, a marine biologist and neuroscientist at the University of Queensland in Australia. "I wouldn't be surprised if we find these cells are much more common across all vertebrates, including terrestrial species."

All three species emit bioluminescence using small light-emitting organs on their bodies, mostly located on the belly. They produce blue-green light that blends with the faint background light from the sun above. This strategy, called counterillumination, is a common form of camouflage in the deep sea to avoid predators.

"Small fish like these fuel the open ocean. They are plentiful and serve as food for many larger predatory fishes, including tuna and marlin, marine mammals such as dolphins and whales, and marine birds," Cortesi said.

These kinds of fish also engage in one of the biggest daily migrations in the animal kingdom. They swim near the surface at night to feed in plankton-rich waters, then return to the depths - 650 to 3,280 feet (200 to 1,000 meters) - during daytime to avoid predation.

"The deep sea remains a frontier for human exploration, a mystery box with the potential for significant discoveries," Cortesi said. "We should look after this habitat with the utmost care to make sure future generations can continue to marvel at its wonders."


Japan City Gets $3.6 Mn Donation in Gold to Fix Water System

FILE PHOTO: Factories line the port of Osaka, western Japan October 23, 2017. REUTERS/Thomas White/File Photo
FILE PHOTO: Factories line the port of Osaka, western Japan October 23, 2017. REUTERS/Thomas White/File Photo
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Japan City Gets $3.6 Mn Donation in Gold to Fix Water System

FILE PHOTO: Factories line the port of Osaka, western Japan October 23, 2017. REUTERS/Thomas White/File Photo
FILE PHOTO: Factories line the port of Osaka, western Japan October 23, 2017. REUTERS/Thomas White/File Photo

Osaka has received an unusual donation -- 21 kilograms of gold -- to pay for the maintenance of its ageing water system, the Japanese commercial hub announced Thursday.

The donation worth $3.6 million was made in November by a person who a month earlier had already given $3,300 in cash for the municipal waterworks, Osaka Mayor Hideyuki Yokoyama told a press conference.

"It's an absolutely staggering amount," said Yokoyama, adding that he was lost for words to express his gratitude.

"I was shocked."

The donor wished to remain anonymous, AFP quoted the mayor as saying.

Work to replace water pipes in Osaka, a city of 2.8 million residents, has hit a snag as the actual cost exceeded the planned budget, according to local media.


Thai Cops Go Undercover as Lion Dancers to Nab Suspected Thief

People gather to watch performers outside Emsphere shopping mall on the first day of the Lunar New Year of the Horse, in Bangkok on February 17, 2026. (Photo by Lillian SUWANRUMPHA / AFP)
People gather to watch performers outside Emsphere shopping mall on the first day of the Lunar New Year of the Horse, in Bangkok on February 17, 2026. (Photo by Lillian SUWANRUMPHA / AFP)
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Thai Cops Go Undercover as Lion Dancers to Nab Suspected Thief

People gather to watch performers outside Emsphere shopping mall on the first day of the Lunar New Year of the Horse, in Bangkok on February 17, 2026. (Photo by Lillian SUWANRUMPHA / AFP)
People gather to watch performers outside Emsphere shopping mall on the first day of the Lunar New Year of the Horse, in Bangkok on February 17, 2026. (Photo by Lillian SUWANRUMPHA / AFP)

Thai police donned a lion dance costume during this week's Lunar New Year festivities to arrest a suspect accused of stealing about $64,000 worth of Buddhist artifacts, police said Thursday.

Officers dressed as a red-and-yellow lion made the arrest on Wednesday evening after receiving a report earlier this month of a home burglary in the suburbs of the capital, Bangkok, AFP reported.

Capital police said the reported break-in involved "numerous Buddhist objects and two 12-inch Buddha statues", along with evidence of repeated attempts to enter the house, according to a statement.

With few leads, police kept watch for weeks before hatching an unusual plan to join a lion dance procession at a nearby Buddhist temple.

"Officers gradually moved closer to the suspect before arresting him," police said.

A video released by police showed the festive lion dancers approaching the suspect before an officer suddenly emerged from the head of the costume and, with help from colleagues, pinned him to the ground.

Police estimated the value of the stolen items at around two million baht ($64,000).

The suspect, a 33-year-old man, has a criminal record involving drug offences and theft, police added.