Supply your own punch line to the title. For example, "No, I don't own a comb." Or, Einstein didn't have a barber. Obviously.
But the idea is that a regular person like a barber has basic questions about how things work, and a genius like Einstein could answer those questions. There are a lot of these books around, and the basic requirements are that the questions be things that the reader might actually wonder about, and that the explanations be understandable. This is a pretty good example of the genre. The topics are interesting, the explanations reasonably clear, and the writing style jokey.
Federal law, or maybe human nature, mandates that I drop two fact-pellets into this review. (1) A full moon looks bigger when it first rises above the horizon, then looks smaller when it's up in the sky. Optical illusion, aka user error. If you hold a ruler at arm's length and note the diameter, it is the same whether near the horizon or in the sky. (2) A can of Diet Coke actually weighs less than a can of regular Coke, because the sweetener in Diet Coke is much lighter than the sugar in regular Coke. You can't feel the difference, but if you put the cans in a sink full of water, the Diet Coke will float higher. (3) Why is one side of aluminum foil shiny and the other side... Sorry, you only get two.