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Words, Things, and Ideas of the Month - December 2025

Each month I take note of words, things, and ideas that caught my attention. Some I stumbled upon while reading, others emerged from conversations or late-night Wikipedia rabbit holes. Here's December: vocabulary worth knowing, historical curiosities, and mental models that help make sense of the world.

1.
Procession

A group of people or vehicles moving forward in an orderly line, typically as part of a ceremony, festival, or formal occasion.

Synonyms: parade, march, cortege

The funeral procession wound slowly through the city streets on its way to the cemetery.

2.
Unnerve

To cause someone to lose courage, confidence, or composure.

Synonyms: demoralize, rattle, disconcert

The soldiers were unnerved by the enemy's overwhelming show of force.

3.
Idea
"Crossing the Rubicon"

A phrase meaning to pass a point of no return — making an irreversible decision or taking a decisive action from which there's no turning back. It originates from Julius Caesar's fateful choice in 49 BC to cross Italy's Rubicon River with his army, defying the Senate and sparking a civil war.

Caesar crossing the Rubicon

Caesar crossing the Rubicon, 19th century illustration

When the couple decided to open their relationship, they knew they had crossed the Rubicon.

Source: Wikipedia

4.
Thing
Insulin Coma Therapy

This was a form of psychiatric treatment (1930s to 1960s) in which patients were repeatedly injected with large doses of insulin in order to induce daily hypoglycemic comas to "reset" the brain over weeks. It was mainly used for schizophrenia. The treatment was eventually discredited and abandoned after studies showed it had no real therapeutic value, though it remained in use in some countries until the late 1980s.

Insulin coma therapy

Dr. Manfred Sakel, who introduced insulin coma therapy in 1927

In popular culture: mentioned in Sylvia Plath's "The Bell Jar"; depicted in the film "A Beautiful Mind" (John Nash received this treatment)

Source: Wikipedia · Britannica

5.
Idea
Boiling Frog Effect

A metaphor for how people fail to recognize threats that build gradually. Drop a frog in boiling water, and it jumps out immediately. But place it in lukewarm water and slowly raise the temperature, and it won't notice the danger until it's too late.

Note: The biology is actually a myth — real frogs will jump out as water heats up. But the metaphor endures because it captures how we normalize slow, incremental change.

Source: Wikipedia

6.
Surreptitious

Done in secret, especially because it would not be approved of if discovered.

Synonyms: covert, stealthy, clandestine

The athlete's surreptitious use of performance-enhancing drugs went undetected for years.

7.
Custodian

A person who has responsibility for taking care of or protecting something or someone.

Synonyms: guardian, keeper, caretaker

The museum's custodian had protected the ancient artifacts for over thirty years.

8.
Neophyte

A person who is new to a subject, skill, or belief; a beginner.

Synonyms: novice, beginner, newcomer

Coordinating both hands while playing piano can be daunting for neophytes.

9.
Convalesce

To gradually recover health and strength after illness or injury.

Synonyms: recuperate, recover, heal

After a severe bout of bronchitis, I spent two weeks convalescing at home.

10.
Idea
Streisand Effect

When an attempt to hide, censor, or suppress information backfires, inadvertently drawing far more attention to it than it would have received otherwise.

Streisand Estate aerial photo

The photo that started it all. Before the lawsuit: 6 downloads. After: over 420,000.

Origin: In 2003, Barbra Streisand sued a photographer for $50 million to remove an aerial photo of her house from a coastal erosion database. The lawsuit turned an obscure image into front-page news.

Source: Wikipedia · Britannica

All Together Now

The procession of whistleblowers walking toward the courthouse unnerved the corporation's executives. They knew they had crossed the Rubicon when they approved those surreptitious cover-ups — there was no going back now. A neophyte journalist, acting as an unlikely custodian of the leaked documents, published everything online. The company's frantic attempts to suppress the story only triggered the Streisand Effect, amplifying the scandal tenfold. Critics compared the public's delayed outrage to the boiling frog effect: the warning signs had been there for years, ignored until it was too late. The CEO, meanwhile, convalesced at a private clinic in Switzerland, reportedly suffering from "exhaustion." Some journalists darkly compared the company's workplace practices to insulin coma therapy — a brutal, discredited attempt to fix what was never truly broken.