Blogs / Personal blogs

John D. Cook

johndcook.com

Companies come to us for help data analysis and data privacy. Clients have included Amazon, Google, Microsoft, law firms, start-ups, and smaller businesses.

Popular posts
79
Total points
14,487
HN comments
7,259
Rank
#49 personal

Visit johndcook.com → RSS feedOn Hacker News Jan 2010 – Sep 2026

Math & Algorithms 44Software Engineering 24Life, Learning & Writing 11Career & Management 11Science & Space 9Programming Languages 6

1

Four Hours of Concentration

As I've blogged about before, and mentioned again in my previous post, the great mathematician and physicist Henri Poincaré put in two hours of work in the morning and two in the evening. Apparently this is a common pattern. Cal Newport mentions this in his interview with Todd Henry. Now we also know that if

2

Dumb and Gets Things Done (2010)

Someone once asked Napoleon how he decided where to assign soldiers. Napoleon's reply was that it's simple: soldiers are either smart or dumb, lazy or energetic. The smart and energetic I make field commanders. They know what to do and can rally the troops to do it. The smart and lazy I make generals. They

5

Bicycle skills

A while back I wrote about learning things just-in-case or just-in-time. Some things you learn in case you need them in the future, and some things you learn as needed. How do you decide whether something is worth learning ahead of time, or whether it is best to learn if and when you need it?