Introduction

The first beds and mattresses were created at least 5 million years ago when apes used layers of plant material to create softer places to sleep. For much of human history, people slept on a softer surface stuffed with plant material or feathers. The inner spring mattress was invented in the 1870s and became popular in the 1930s. In the second half of today's lesson, I'll show you what it means to fine tune something. We have a quote of the week, which will probably anger some of you, but you don't have to agree with it to laugh.

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