Like many preschoolers, Christopher Salvaggio fires off a seemingly incessant stream of questions.

But some of this Houston native's questions - such as "What happens to food after you eat it?" - are a challenge for his parents to answer in enough detail to satisfy his seemingly endless appetite for knowledge.

The 3-year-old, who now has a working knowledge of the solar system, the cardiac cycle and the works of Pablo Picasso and Vincent van Gogh, was accepted last week into Mensa, a society for those with IQs in the top 2 percent of the population.

Christopher has an IQ of 145 and reasoning and thinking abilities that exceed 99.9 percent of children his age, according to his evaluation.

"He asks questions all day long," says his mother, Kate Salvaggio. "He wants to know how things work … He keeps me on my toes. He is 3 years old right now, and I keep thinking 'What am I in for in the future?' "

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I guess not...