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Top View [Puzzle] If the first image below is a side view, and the second image is the front view (as viewed from the arrow).

#engineering drawing #Puzzle

The Wrath of Khan The global impact of forest re-growth in even the long-lasting events was diminished by the continued clearing of forests elsewhere in the world.

#genghis khan #mongol invasions

Pi Day Paradox

Here’s the infamous “proof” that shows that π is equal to 4.

The zig-zagged polygon, whose perimeter always remains 4, does appear to approach the circle as we repeat these steps to infinity. Ergo, π is equal to 4!

The problem, as Vi Hart explains in this amusing math doodle video, is that while the area of the polygon does approach the area of the circle, the actual perimeterof the polygon is…

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#Paradox #Pi #Pi Day

Ghosts of Evolution [HT: brain pickings]

#Evolution

Counterfeit Coin [Puzzle]

There are 12 coins, one of which is a counterfeit. The false coin differs in weight from the true ones, but you don’t know whether it’s heavier or lighter. Find the counterfeit coin using three weighings in a pan balance.

[From Futility Closet]

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#Logic Puzzle #Puzzle

No Alternative

The “pulping” of Wendy Doniger’s The Hindus: An Alternative Historyby Penguin is yet another blow…

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#Hinduism #penguin india #religious intolerance #The Hindus #the hindus and alternative history #Wendy Doniger

Belphegor's Prime

1000000000000066600000000000001 is a palindromic prime number, which contains the number of the…

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#belphegor #belphegor&039;s prime #Prime numbers

Periodic Table of Dots

Simple, minimalist, and elegant. From here.

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#periodic table #periodic table of elements

Happy Thanksgiving!

Here’s a little turkey-day trivia:

When Europeans first encountered this bird, they mistakenly identified it as guinea-fowl, which were also known as turkey fowl because they were imported to Europe through Turkey.

In Turkish, the bird is known as…

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#thanksgiving #trivia #Turkey

Pythagorean Puzzle

From here.

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#Puzzle #Pythagoras Theorem #Pythagorean Theorem #Recreational Math

What If

What if Vallabhbhai Patel, not Nehru, had been India’s first Prime Minister?

Here is a cursory yet…

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#India #Nehru #Ramachandra Guha #Sardar Patel

Giant Jelly [Puzzle]

[Source: DataGenetics, Pic Courtesy: CREATTICA]

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#Puzzle

If arithmetic were debated like religion

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#Atheism #Math #Religion #SMBC

Age of Dinosaurs

The first of the dinosaurs appeared around 231 million years ago, and they dominated earth for more…

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#Dinosaurs #Evolution

John & Julio

I found the following thought experiment stimulating:

Suppose two men, John and Julio, are heading to a job interview. Julio tells John: “I need this job more than you do. Please drop out of the race so I get it.” It’s perfectly reasonable for John to…

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#Bryan Caplan #Immigration #Open Borders

Honda Illusion

[youtube=http://www.youtube.com/watch?v=UelJZG_bF98&w=510&h=317]

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#Illusion

The Outlawed Letters

“There is a story about Mustafa Kemal Atatürk practising his signature in the Latin alphabet. The…

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#K Atatürk #Linguistic Nationalism #Turkey

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