Author Archives: thetechn
Divisibility by 7 is a walk on a graph by David Wilson
My guest blogger is David Wilson, a fellow fan of sequences. It is a nice exercise to understand how this graph works. When you do, you will discover that you can use this graph to calculate the remainders of numbers modulo 7. Back to David Wilson:
I have attached a picture of a graph.
Write down a number n. Start at the small white node at the bottom of the graph. For each digit d in n, follow d black arrows in a succession, and as you move from one digit to the next, follow 1 white arrow.
For example, if n = 325, follow 3 black arrows, then 1 white arrow, then 2 black arrows, then 1 white arrow, and finally 5 black arrows.
If you end up back at the white node, n is divisible by 7.
Nothing earth-shattering, but I was pleased that the graph was planar.
Tanya Khovanova's Math Blog
Mathematics, applications of mathematics to life in general, and my life as a mathematician.
Chris Burkard Photo
Finding the perfect Arctic surf shot
Mike Maloney
Binary two's complement
Post a secret
Fashion by Mayhem
Java File: Reading and Writing Files in Java
The Wheel of Fortune - javascript
A JIFFY IS USED AS AN ACTUAL UNIT OF TIME
Mathematical Induction
Skiena's Algo lectures
Bionic Roses
The real 10 algorithms
The Heroes of Telemark
WWII Hero Credits Luck and Chance in Foiling Hitler’s Nuclear Ambitions
The Heroes of Telemark - Kirk Douglas
Billie Holiday - The Best Of jazz forever
Deitel Python Resource Center Tutorials
Make Yahoo! Web Service REST calls with Python
Programming is terrible—Lessons learned from a life wasted. EMF2012
Michio Kaku (2014) "Coming Breakthroughs" [FULL SPEECH]
Steve Cole - Stay awhile
Deitel - Game Programming resources
Big Think - Dr. Michio Kaku
Dr. Michi Kaku
The World in 2030 by Dr. Michio Kaku
Billy Holiday - The Best of Jazz forever
Send a Meal
Shuffling algorithm analysis
Code Visualizer for Racket
Online Programming Visualizer
EV3 Technology - Motors
EV3 Software Programming
THE PASSWORD IN YOUR EYE -- Mind Blow #90
Lejos EV3 Tutorials
Java Programming Tutorial - thenewboston
Python Programming Professional Bundle
Wearable Mood Controller -- Mind Blow #96
Nearly All Binary Searches and Mergesorts are Broken
An introduction to Cherry MX mechanical switches
1,000,000,000,000 Frames/Second Photography - Ramesh Raskar
Planned Parenthood
Cecil Richards
Today Richards oversees a federation with more than 10,000 employees at 700 Planned Parenthood centers across the country. (She also helms their Action Fund.) Even in the face of deep state and federal funding cuts, the organization remains one of the largest reproductive health care providers in the nation. Abortion services constitute 3 percent of the care it provides—meaning that, yes, Planned Parenthood is where roughly 300,000 women will choose to terminate a pregnancy in any given year, often because it is the only place in their state they can do so. But those same health centers also administer more than 10 million medical services yearly—the majority to women and teenagers living in rural or medically underserved areas. That includes 4.5 million tests and treatments for sexually transmitted infections, and nearly a million screenings for breast and cervical cancer. One in every five women has visited a Planned Parenthood in her lifetime; a full 10 percent of patients are men.