Cassallen writes: "Many people are concerned both about saving money and living green, but often it can seem like it is difficult to do both at the same time. There are many things that are more expensive when they are more environmentally friendly, for example, things made from recycled materials. But there are things that seem to be more expensive, such as LED lights that are really a big money saver when you look at the big picture."
As far as the laws of mathematics refer to reality, they are not
certain, and as far as they are certain, they do not refer to reality.
-- Albert Einstein