Dey Street Books
What If?: Serious Scientific Answers to Absurd Hypothetical Questions
A bestselling book answering absurd hypothetical questions with real science.
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Where it ranks in our guides
A medal marks a podium; the score on the right is the product’s score for that recipient.Scores by criterion
Pros and cons
What we like
- Each chapter answers a single absurd question, so it is easy to dip into
- Answers rely on real physics and calculation
- Includes xkcd-style stick-figure illustrations
- Works for both teens and adults
What may bother
- Some explanations lean on math and physics that may take effort
- Not a continuous narrative, so it is read in pieces
- Dated pop references can feel old in places
Our verdict
84 / 100A fine gift for a curious teen or an adult who enjoys xkcd and science with humor. Avoid it for someone who wants light fiction or who finds physics tedious.
Frequently asked questions
Do you need a science background to enjoy it?
No, it is written for a general audience and explains the science in an accessible way.
Is it appropriate for teens?
Yes, it works well for curious teens and adults alike.
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How we score
The CTG score out of 100 is the weighted average of five criteria rated for every product: proven reliability (36%), perceived value (18%), bond and memory (18%), originality (14%) and novelty (14%). Each criterion has its own published scale, identical for every product: it rates generously, because every product in our selection is already good. The score does not depend on the guide. 60 to 69: average gift. 70 to 77: good pick. 78 to 85: safe bet. 86 to 89: favorite. 90 and above: the perfect gift, a label reserved for excellent products that customers like, one winner per occasion. In a guide, the score for the recipient combines this score with the place in the ranking. The budget is an indicative range: the exact price is shown by the store at checkout. Read our full selection method →