## Calculus: concept of a limit

Tutoring calculus, the idea of a limit is important. The tutor mentions some thoughts. A limit, in calculus, is important, because it opens the door to certain functions, procedures, and assumptions. Numerous mechanisms are available to prove or disprove the …

## Electronic lifestyle: location by smart phone

Self-tutoring about smartphone features: the tutor mentions a quick fix for the wrong location. I decided to check my location on my phone, and discovered I was a few blocks away. How could it be? I checked the Internet; one …

## Energy: what about tidal power?

Self-tutoring about sources of green energy: the tutor looks into tidal power. Nowadays, we hear much about energy from sun and wind. For decades we’ve heard about hydroelectric power, almost always from dams of rivers. Ocean tides also represent a …

Self-tutoring about botany: the tutor mentions a surprise about the Canada thistle. As a Canadian, I’m proud to say I’ve been stung by the Canada thistle likely hundreds of times, or even more, since early childhood. Its spiky leaves and …

## Computer skills: why a search might return a page that doesn’t seem to have the search term

Self-tutoring about everyday computer situations: the tutor mentions one that can be tiring. Occasionally, one might want to know if a term exists within a web site. Using a search bar, one might check for said term. A page might …

## Lifestyle: Port Moody

Self-tutoring about places to visit around BC: the tutor mentions Port Moody. I watched a martial arts tournament in Port Moody over the weekend. Before that, I don’t believe I’d been to Port Moody. However, I would be happy to …

## Physics: position and displacement

Tutoring physics, you encounter definitions. The tutor distinguishes between position and displacement. Position is the location of an object, whereas displacement is change to its location. Therefore, to know an object’s position after a displacement, one must also know its …

## Statistics: theory about the degrees of freedom

Self-tutoring about statistics: the tutor mentions some intriguing ideas (and resources they came from) about degrees of freedom. Degrees of freedom (df) is a concern in calculating statistics, eg., the t or Chi-squared, since the higher the df, the more …

## Statistics: the two “five” criteria

Self-tutoring about the binomial distribution: the tutor mentions a couple of criteria for approximating it to the normal distribution. The binomial, given enough trials, settles into a normal distribution. Yet, how many trials, or what other conditions, might suggest this …

## Chemistry: amorphous solids

Self-tutoring about chemistry: the tutor mentions the idea of amorphous solids. Among solids, the amorphous ones might be thought of as the complement to crystals. Amorphous solids don’t have the repeating order that crystals do; rather, the local collection/arrangement of …