Lifestyle: no cream in my coffee: possible weight loss implications?

The tutor asks, “How much weight loss, theoretically, might I realize from giving up cream in my coffee?”

It seems I’ve been served with a high cholesterol warning: likely, I should bring it down. With saturated fat being implicated as a potential cause of high cholesterol, the cream in my coffee gains attention. It’s got 1.5g of fat per Tbsp, 1g of which is saturated. Although I’ve not been told directly, I’m probably best to give it up: I already have.

Let’s imagine I use(d) 1 Tbsp cream per cup of coffee. Commonly, I drink 8 cups of coffee per day, so would use 8 Tbsp cream, each of which is 20 calories. That’s 160 calories per day, and 160*365=58400 calories per year. One pound of fat is about 3500 calories, so the 58400 calories could translate to around 58400/3500 = 16.7 pounds. I might, theoretically, “lose” 16.7 pounds per year by stopping using cream in my coffee.

While I’ve given it up, I loved having cream in my coffee.


Jack of Oracle Tutoring by Jack and Diane, Campbell River, BC.

Chrome: Developer tools (view page source): ==$0

The tutor talks about ==$zer0 in Chrome’s Developer tools.

Looking at a page source in Google Chrome, I saw the entry ==$0. It wasn’t manifesting on the page itself; I wondered if it was a type of HTML comment.

Apparently, ==$0 shows the element you’ve selected to inspect. Chrome itself prints it in the page source to help you find the line that produces the element you’ve chosen. It’s not content.


Jack of Oracle Tutoring by Jack and Diane, Campbell River, BC.

English: how to define a term

The tutor offers clarification about what a definition does.

Often, in an English essay, the writer might need to define a term. From a working point of view, what does a definition do?

According to Harbrace1, a definition gives similar concepts (or nouns) to the one being defined, afterwards explaining how the term of interest is different from the other similar ones.

An example:

A desktop computer is similar to other devices of web communication, such as smartphones and laptops. A typical difference between the desktop computer and the other devices is that a desktop computer has a separate keyboard.


1Hodges, Horner, et al. Harbrace Handbook for Canadians, 6th ed. Scarborough: Nelson Education, Ltd, 2003.

Jack of Oracle Tutoring by Jack and Diane, Campbell River, BC.

Navigating the file system from the terminal (aka Command Prompt): how to enter a two-or-more word directory or file name

The tutor shares a hint he noticed recently.

When I started with computers, I don’t believe you could have a folder name like this folder: as I recall, you couldn’t have a space in the name. (You could have an underscore as in this_folder).

I don’t know for sure, but I’d say Windows opened up the possibility of having a space in the name of a folder (or file). Nowadays, on people’s desktops, you commonly see folders with two-or-more word names, such as Road Trip Summer 2016 or Kitchen Reno. (I wonder if anyone else realizes what computer users seem to take for granted:)

On the desktop, two-word names don’t matter: you can just double-click the folder to open it. In the terminal, though, you need to type the folder (aka directory) name to enter it. Will the terminal know what you mean when you type a folder name that contains a space?

The terminal (aka, Command Prompt) in Windows 7 does understand a two-word name. For instance, if you want to enter the Kitchen Reno directory, just typing

cd Kitchen Reno

will work.

In the Linux terminal, from my experience, the command

cd Kitchen Reno

won’t work. However, you’ve got two options that will:

  1. cd “Kitchen Reno”
  2. cd Kitchen\ Reno


cd “Kitchen Reno”

works in both Windows 7 and Linux:)

Jack of Oracle Tutoring by Jack and Diane, Campbell River, BC.

Computer science: JavaScript: null value, undefined type and value

The tutor comments on JavaScript null and undefined.

Null, it seems, is often mentioned in computer science. Perhaps it’s used a little loosely: it might refer to the value read when there’s nothing there, or the value of a variable that doesn’t exist.

In JavaScript, in my experience:

Botany: mast and masting

The tutor shares a couple of terms he recently learned.

In a forest setting, mast can refer to food dropped from trees and bushes, such as acorns, nuts, or berries.

Masting refers to the trees’ production of the mast, but can specifically mean their coordinated production of bumper crops some years, thin ones other years.

Mast and masting are interesting to the botanist, but perhaps even more so to the sportsman, since produce from the trees influences the behavior of game.

I’ll be talking more about mast and masting.


Jack of Oracle Tutoring by Jack and Diane, Campbell River, BC.

Web design: AngularJS

The tutor introduces an advantage of AngularJS

I’ve been aware of AngularJS for a while now, but today I looked into it attentively.

From my point of view, one advantage of AngularJS is that it can access html directly: variables can be evaluated inside html tags.

The coding for this demo is all contained within html element tags.


Jack of Oracle Tutoring by Jack and Diane, Campbell River, BC.

Oak trees: do red oaks produce acorns every year?

The tutor shares the answer to a question he’s long harboured.

Generally, red oak acorns take two years to mature. Does that mean the tree drops a crop of acorns only every second year?

According to Cathy Blumig of, red oaks flower every year. Therefore, they certainly can produce acorns every year: this fall’s acorns will be from the flowers of sixteen months ago, rather than from the recent spring. Next year’s acorns, in turn, will be from this spring’s flowers.

While the quantity of acorns from a red oak may vary from year to year, the tree can definitely produce them every year.

Jack of Oracle Tutoring by Jack and Diane, Campbell River, BC.

Botany: black walnut: juglone

The tutor researches the effects of juglone from black walnut trees.

Juglone is a toxin produced by the black walnut tree; it’s found throughout the tree and in its leaves, shells and nuts.

Apparently, to humans eating the walnuts, the juglone is not a problem. However, it enters the soil from the roots of the black walnut tree, as well as from its leaves, twigs, and even pollen falling to the ground – not to mention the nuts and their shells. Some plants, such as tomatoes, potatoes, lilacs, and rhododendrons, can be damaged by the juglone.

To be safe, composted matter from black walnut should wait a year or more before application.

Horses are particularly sensitive to juglone; neither black walnut shavings, nor the husk fibre, etc, should be used in a horse’s environment.


Jack of Oracle Tutoring by Jack and Diane, Campbell River, BC.