Compact Toilet Rolls

Ah, the glamour of international travel. I thought this was cool. This is a package of toilet paper we picked up at the nearby Walmart on our vacation in Puerto Vallarta. Notice that the inner rolls are flattened to reduce the overall packaging size. I’d never seen this before. Since toilet paper is lightweight it’s…

Split Air Conditioning Systems

Canada has summer too, eh I talked about how air conditioners worked in a previous post.  Living in Canada, if houses have air conditioning they are usually tied into a central forced air heating system. Principle 5 – Merging The same fan, thermostat, and set of ducts and vents can be used for cooling or heating. Principle…