The Book of General Ignorance by John Lloyd and John Mitchinson

Someone gave me this book, but I don’t remember when. It’s been sitting in the smallest room in the house for quite a while, because it’s the kind of book that’s best to dip into. It consists of more than 200 questions that you might think you know the answer to, but probably don’t.

So the first question is: “What’s the name of the tallest mountain in the world?” Mount Everest, you say? Well, actually, according to the current convention, the “tallest” mountain in the world is Hawaii’s Mauna Kea. It boasts the greatest distance between its top and bottom (33,465 feet). It just so happens that its bottom is in the ocean. Mount Everest, on the other hand, is the “highest” mountain, measured from sea level up to its summit (at 29,029 feet).

It’s that kind of book.

One more:

“What shape did medieval people think the earth was?” The authors don’t actually say. What they do say is that hardly anyone thought it was flat. The idea that Columbus was trying to prove the earth was round most likely originated in a book by Washington Irving written in 1828. Ten years later, an Englishman seriously tried to prove it was round. The subtitle of his book was “A Description of Several Experiments Which Prove That the Surface of the Sea is a Perfect Plane and That the Earth Is Not a Globe”. Columbus thought it was pear-shaped and about a quarter of its actual size. (Back around 200 B.C., a very smart man named Eratosthenes of Cyrene got within 10% of the actual circumference.)

Ok, just one more: “What is the loudest thing in the ocean?” This one I found hard to believe. The blue whale produces the loudest noise of any individual animal in the ocean or on land, but the loudest natural noise of all is made by shrimp. So-called “snapping shrimp” live in tropical and subtropical waters. Trillions of them will get together and snap their single over-sized claw all at once. The sound they make has been measured at 246 decibels (the equivalent of 160 decibels in the air, or louder than a jet plane taking off). The sound of this “shrimp layer” can damage a submarine’s sonar and make dents in a ship’s propeller. Really?

Yes, it’s that kind of book.