1
Rotating Images
How to rotate an image, and a need trick to rotate a bitmap an arbitrary amount in a simple paint package.
DataGenetics
Nick Berry's blog of puzzles, probability, data and mathematics, 2009–2022.
- Popular posts
- 19
- Total points
- 3,473
- HN comments
- 1,290
- Rank
- #387 personal
Visit datagenetics.com → RSS feedOn Hacker News Mar 2012 – Jul 2020
Math & Algorithms 18Science & Space 7Games & Graphics 5Security & Privacy 2Software Engineering 2Tools & Productivity 1
2
How far can you overhang blocks?
How hungover can you get? Kids blocks and Calculus!
3
Visual Cryptography
How to create perfect secret messages that can be decoded using just your eyes.
4
Analysis of bank PIN numbers
Is your PIN number too predictable? Detailed analysis on PIN number databases.
5
The Two Egg Problem
Analysis of the classic "dropping two eggs from a building" interview question
6
A Better Strategy for Hangman
Learn the optimal strategy for playing Hangman.
7
Wounded QR Codes
How do QR codes work? How much is it possible to distort one and still have it readable?
8
Why are roller coaster loops not circular?
Why are the loops on roller coasters never circular?
9
Why cans of soup are shaped the way they are
What is special about cylinders, and why do they have specific aspect ratios?
10
Impossible Escape?
Can you use math to escape from, what seems like, an impossible prison escape problem based on coins and a chessboard?
11
Voronoi Tessellations
Mapping nearest locations.
12
How Hamming codes work
Detecting (and correcting) errors in digital signals.
13
Parrondo's Paradox: How two ugly parents can make a beautiful baby
"How two ugly parents (mathematically) can make a beautiful baby"
14
Gray Code
What are Gray codes, and why are they so useful?
15
How to escape a monster (using calculus)
You are sitting in a rowing boat in the middle of a circular lake. How do you escape from a smart monster on the shore who can run four times faster than you can row?
16
Cylinders in Spheres
What is the largest volume cylinder it is possible to carve from a solid sphere? Also, so you know about the napkin ring problem?
17
Why 'gallons per mile' is better than 'miles per gallon'
Why we should really be quoting fuel consumption figures as 'gallons per mile' and not 'miles per gallon'.
18
An aerospace engineer explains fireworks
A quick look at the ballistics and stability of aerial fireworks.
19
Why telephone keypads are arranged the way they are
Why are the push buttons on a telephone arranged the way they are?