NABLU

If you're old enough to remember the days of cathode-ray tube (CRT) television sets and monitors, you might, if your hearing was good, also remember the high-pitched 15 kHz squeal emitted by the electron beam's horizontal oscillator.

A gyroid is a fascinating geometric structure.

Have a look at this centipede walking.

I recently joined a Toastmasters club local to me, to improve my public speaking skills.

You don't see aircraft with elliptical wings anymore.

A recent project to create an ergonomic handle for 3D printing led me down a path that introduced me to anthropometric measurements of the human hand, which in turn revealed some interesting facts about hand sizes.

Back in July 2005 I became intrigued with crafting weird and improbable magical items for the amusement of my Dungeons and Dragons gaming group.

I learned this card trick in the fourth grade, decades ago, before the World Wide Web existed.

A game master / dungeon master (DM) should never allow a player to bring 3D printed dice to a game.

I decided to create a procedurally-generated 3D landscape in a CAD program, and wrap it around a globe, which led me to an investigation of erosion algorithms.

The Bollinger Bands plot on a price bar chart is a common component of technical analysis among financial traders.

Some years ago I visited the Exploratorium in San Francisco, where I saw an impressive work of kinetic art, a large mechanical contraption with many articulated legs made from PVC pipe.

When my employer switched over from the Google office suite to Microsoft's Office 365, it caused unexpected disruption in my family.

This is an intellectual exercise with a practical end-result.

There are stories on the internet about "the fourth little pig", but before I ever saw those, a decade ago I made up my own story called The four little pigs as a bedtime story for my toddler.

Practitioners of agile project management, particularly the scrum agile framework for software development, might be familiar with with this problem: When the project starts, there are many stories and tasks in the project backlog.

This entry has nothing to do with numerical methods, mathematics, logic, gaming, or anything else I've written about.

My son and I began playing Minecraft together, me on my Windows laptop and him on his iPad.

Thrust from air So now we're ready to put all the calculations together: launch tube, water thrust, air thrust, and ballistic flight.

Thrust from water Numerical calculations After the water is expended, the tank (bottle) still contains substantial pressure that releases quickly through the nozzle.

Launch tube thrust Thrust from air Once the rocket has left the launch tube, the water thrust phase of the flight begins.

The water rocket: Introduction Thrust from water A launch tube inside the bottle does two important things: A tube with its open end above the water level keeps the water from spilling into the launcher pipe-work, leaving it inside the bottle for the rock…

Launch tube thrust I recently became interested in water rocketry after realizing how complicated the physics actually can be, and the fact that the equations are best solved with numerical methods because so many interacting variables change rapidly in a…

While I'm on the subject of Dungeons & Dragons (see my previous post on ability score probabilities), I recall something I did involving a tesseract way back in 2007 and posted on the community forum of Wizards of the Coast.

There's an element to the game Dungeons & Dragons that lends itself to a numerical analysis: the initial array of ability scores assigned to a character.