How Compound Interest Actually Works

Chart showing compound interest on 10,000 at 7% over forty years with the gain in each decade

Compound interest gets described as money earning money, which is true but does not convey why it matters. What matters is that the effect is not gradual. It is almost nothing for a long time, and then it is enormous, and most people give up during the part where it looks like nothing is happening. … Read more

How to Read Your Pay Stub

Annotated diagram of a pay stub showing gross pay, taxes withheld, deductions and net pay

Most people glance at one number on a pay stub and file the rest. That is understandable, because the layout is dense and half the labels are abbreviations nobody explained. It is also how payroll errors go unnoticed for months, and how people end up surprised by their tax return. Every pay stub, whatever the … Read more

How Thick Should a Concrete Slab Be?

Diagram showing concrete slab thickness of 4, 6 and 8 inches with the loads each carries

A concrete slab that cracks, sinks at one corner, or lifts after a hard winter almost never failed because the concrete was weak. It failed because of what was underneath it, or because nobody cut the joints, or because it was an inch thinner than the job needed. Thickness is the decision people agonise over … Read more

How to Build a Gravel Driveway That Lasts

Cross-section diagram of a gravel driveway showing three compacted layers over geotextile fabric

Most gravel driveways that fail do not fail because someone skimped on stone. They fail because the water had nowhere to go, or because the layer underneath was never right in the first place. Put six inches of beautiful stone over soft ground and within a winter you will have ruts, a soft patch by … Read more