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A family has two children. At least one of them is a boy.
What is the probability that both children are boys?
Intuition says 1/2 (50%).
Probability Theory says 1/3 (33.3%).
Can you explain why intuition fails here before expanding the reply? 🧵👇
📅 Join the @MensaFoundation Speaker Series: "The Polymath Advantage" featuring Dr. Angela C. Meyers.
Dr. Meyers wrote the first doctoral dissertation dedicated to polymathy studies, exploring how cross-domain learning changes how we solve complex problems. 🧵👇
🎙️ Topic: The Polymath Advantage
📅 Date: Thursday, Sept 26
⏰ Time: 2:00 PM Central
🎟️ Reserve your spot: mensafoundation.ticketspice.…
📖 Read her preview article: mensafoundation.org/rethinki…
#Polymathy #MensaFoundation #LifelongLearning
Zeno of Elea proved, in 450 BC, that motion was logically impossible. He was wrong. But it took mathematicians 2,000 years and the invention of calculus to prove it. The real story isn't the paradox. It's the 2,000 yrs. What "impossible" today just needs a tool not yet invented?
There is a box puzzle in philosophy so disruptive that scientists and philosophers can't even agree on whether it’s a valid question.
It’s called Newcomb’s Paradox—and it tests whether you believe human choice can outsmart a perfect prediction model.
Here is the game: 🧵👇
The catch: Yesterday, the Predictor foresaw your choice.
• If it predicted you take Box B only 📷 it put $1M in Box B.
• If it predicted you take both 📷 it left Box B EMPTY.
Do you take Box B, or both?
Game Theorists say take BOTH ($1,000 extra regardless).
Volitionists say take BOX B ($1,000,000 guaranteed reward).
What is your move?
#Mensa #GameTheory #Paradox
A child asks why the moon follows the car. The honest answer takes longer to explain than the question took to ask. Most adults pick a different honest answer: the short, slightly wrong one.
#MensaInternational #HowWeThink #CuriousMinds
This happens constantly and nobody plans it. A kid asks something genuinely good — why is the sky dark at night if there are infinite stars, why doesn't the moon fall, why can't you remember being a baby — and the real answer takes ten minutes to do properly.
So the short-but-honest answer gets used instead: "it just does." Nobody's lying. They're triaging. But it's worth noticing how many real, answerable mysteries get quietly closed before age seven simply because nobody had ten minutes.
@MensaInternatl
Changing your mind isn't a weakness.
It's one of the strongest signs of learning.
What's one idea you've changed your mind about?
We'll read every reply.
#Mensa
The research is unambiguous & almost entirely ignored by those who design classrooms, meetings & open-plan offices. Highly intelligent people experience boredom differently—more intensely, physically, urgently. It's a signal: input insufficient. We changed the input.
Here's a quick Mensa puzzle, free, right now:
You have 8 balls, identical in every way except one is slightly heavier. You have a balance scale and exactly 2 weighings. Find the heavy ball.
No pitch. Just the puzzle. Reply if you crack it.
Mensa Foundation 2026 Colloquium – Brain Health Across the Lifespan
Tue 30 June 2026, 18:00–23:30 GMT | Online & In-person
Sleep, nutrition, laughter, medical breakthroughs & more.
MIL members save 25% with code: MIL2026
Register: mensafoundation.org/colloqui…
You can instantly become an expert in one subject.
The catch:
Everyone else instantly becomes an expert in the same subject too.
What do you choose?
#mensa @MensaInternatl
You're in a meeting. You can see the plan has a critical flaw. What do you do?
Which one do you actually do? (Not which one should you do.)
90%• Say it now, directly
10%• Say it after, privately
0%• Write it down
0%• Let it fail
10 votes • Final results
3/ The boredom is a signal, not a character flaw. It means the current input is insufficient for the current processor.
Every teacher who called it "not paying attention" was half right about the symptom and completely wrong about the cause.
4/ Finding one room where none of this is a problem is worth more than most people realise until they find it.
We've been building that room since 1946.
mensa.org
