The Great Hedge of India: A Thorny Wall Built for a Salt Tax
In the 19th century the British ran a customs line across India — much of it a dense thorn hedge — to stop untaxed…
Read article →History
The strange stories behind everyday things.
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Why Does India Drive on the Left?
Why Does India Drive on the Left?
India drives on the left because of British rule — but the deeper reason may go back to riders keeping their sword hand free.…
Read article →The Story of the ₹ Rupee Symbol
The Story of the ₹ Rupee Symbol
India adopted the ₹ symbol in 2010 after a national design competition. Who designed it, what the shape means, and how it reached keyboards…
Read article →Why Do We Have Time Zones? Railways Invented Them
Why Do We Have Time Zones? Railways Invented Them
Until the 1800s every town kept its own time by the Sun. Railways and telegraphs made that chaotic, leading to standard time and, in…
Read article →Why Do We Have Leap Years? (And Why 1900 Was Not One)
Why Do We Have Leap Years? (And Why 1900 Was Not One)
A year is about 365.2422 days, not 365. How leap years fix the drift, why century years are usually skipped, and how this affects…
Read article →The Indian Mathematician Who Measured Everest: Radhanath Sikdar
The Indian Mathematician Who Measured Everest: Radhanath Sikdar
In 1852 Radhanath Sikdar, a mathematician with the Great Trigonometrical Survey, worked out that "Peak XV" was the highest mountain on Earth. The story…
Read article →Who Invented Zero? India’s Gift to Mathematics
Who Invented Zero? India’s Gift to Mathematics
Zero as a number — something you can add, subtract and multiply — was first written down in India. Brahmagupta's rules from 628 CE,…
Read article →The First “Computer Bug” Was a Real Moth (Mostly)
The First “Computer Bug” Was a Real Moth (Mostly)
In 1947, engineers working on the Harvard Mark II found a moth stuck in a relay and taped it into the logbook as the…
Read article →Why Is a Week Seven Days Long?
Why Is a Week Seven Days Long?
Months follow the Moon and years follow the Sun, but the seven-day week follows the seven "planets" ancient people could see. Why Ravivar to…
Read article →Why Is Indian Standard Time 5 Hours 30 Minutes Ahead?
Why Is Indian Standard Time 5 Hours 30 Minutes Ahead?
IST is set by the 82.5° East meridian near Mirzapur — exactly 5½ hours from Greenwich. How India chose a half-hour time zone and…
Read article →Why Is the “Save” Icon a Floppy Disk? A Short History
Why Is the “Save” Icon a Floppy Disk? A Short History
The floppy disk save icon outlived the floppy disk by decades. Where the 3.5-inch disk came from, why it became the save symbol, and…
Read article →The Surprising History of Undo, Cut, Copy and Paste
The Surprising History of Undo, Cut, Copy and Paste
Where Ctrl+Z, Ctrl+X, Ctrl+C and Ctrl+V came from — from Xerox PARC’s modeless editing to the Apple Lisa and Windows keyboards we use today.
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