An introduction to mathematical probability takes readers on a comprehensible tour through relevant vocabulary and concepts, providing engaging scenarios to illustrate each. "If something can happen, it's a possibility." Which means, of course, "something that can't happen is impossible." But between these two extremes are a range of related concepts: beyond certainty-when something is sure to happen-some things are more likely than others. Things more likely to happen than not are probable. Things possible but not likely are improbable. Odds describe the chances that something will happen in numerical terms. Each idea is represented by one or more playful photographic scenarios, and as understanding builds, the examples become more complex, so that Squidgy the stuffed bear, who has 10 different shirts and 10 different pairs of pants, is shown dressed in each of 100 possible outfits. But the odds of him wearing a leopard-print shirt and purple pants tomorrow? Only one in 100. (Ages 6-9)