To solve the problems in this book, you do not need to have any special knowledge. You do not even need to write anything down. You just have to think. Unlike regular problems, these STEM problems are not boring, but rather intriguing. Most of them are not new. They are scattered throughout other books and magazines or circulating as math folklore in elite high schools and universities. Top employers like Microsoft, Goldman Sachs, Google, etc. use many of these problems as job interview questions.This collection of 176 problems includes a number of the most impressive problems in the world. Difficult problems are marked with an asterisk (*).Each problem has a hint and a solution. Some problems have "evil twins": a small change in the condition of a problem leads to a different answer. One problem - 2.3 - has two correct solutions with different answers for the same condition, as strange as it sounds. So even if you have solved a problem, take a look at its solution as well.
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