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Description
The Lady or the Tiger?: And Other Logic Puzzles"Another scintillating collection of brilliant problems and paradoxes by the most entertaining logician and set theorist who ever lived." Martin Gardner "Smullyan is not your run of the mill puzzlemeister; he polishes up old chestnuts, spins variations on a theme, and peoples his logical world with a delightful cast of characters." Science 82 "I believe Ray Smullyan to be the Lewis Carroll of our times. His little books of logic puzzles will be
"Another scintillating collection of brilliant problems and paradoxes by the most entertaining logician and set theorist who ever lived." -- Martin Gardner"Smullyan is not your run-of-the-mill puzzlemeister; he polishes up old chestnuts, spins variations on a theme, and peoples his logical world with a delightful cast of characters." -- Science 82
"I believe Ray Smullyan to be the Lewis Carroll of our times. His little books of logic puzzles will be remembered long after most of us are forgotten." -- Peter Denning, Chairman of the Computer Science Department, Naval Postgraduate School
"You may experience small frissons of delight as you follow Smullyan into the dizzying heights of G del's proof and the very nature of proof, truth, and logic in mathematics." -- Kirkus Reviews
Discover scintillating new perspectives on the principles of mathematical logic with this puzzle treasury. Inspired by the classic tale of a prisoner's choice between two doors, these whimsically themed challenges allow readers to base their decisions on logic rather than luck. Nineteen chapters advance from relatively simple puzzles and meta-puzzles to highly complex paradoxes involving probability, time, and change. The author, a well-known philosopher and magician as well as a celebrated mathematician and logician, was acclaimed by The New York Times as "a master at translating difficult ideas into stories and puzzles that require no formal background, only patience and a passion to learn."
Binding Type: Paperback
Publisher: Dover Publications
Published: 04/23/2009
ISBN: 9780486470276
Pages: 240
Weight: 0.57lbs
Size: 8.78h x 5.17w x 0.49d
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4.6 ★★★★★
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★★★★★ 5
Pricey, but worth it.
Coola products were included in a swag bag for a work vacation at a resort & I’ve not looked back. (The smell of the body spray sunscreen made me wish I could eat it, tbh.) This product has become my daily sunscreen as it’s the only one I’ve tried that doesn’t cause my skin to break out. I love the natural ingredients in their products AND that it doesn’t add to reef barrier breakdown. I only wish the brand wasn’t so pricey, but the benefits are worth it to me.
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Reviewed in the United States on December 23, 2025
★★★★★ 5
Best sunscreen ever
Best sunscreen ever, never get burned when I use it
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Reviewed in the United States on April 24, 2026
★★★★★ 5
Terrific sunscreen!
I found out about the Sun screen from a youtuber who does Amazon favorites videos. At first, I thought she was nuts for advertising a $32 sun screen especially for the size it is. I really wanted an everyday sun screen that wasn't thick and goopy. I don't mind of I'm going to the beach or pool but a lot of them are a little much for every day use. Im trying to be better at protecting my face.. When I came across this I decided to splurge and try it. I hate to admit it but I'm so glad I did! It has a slight scent but nothing over powering at all. Its truly a weightless sunscreen that is perfect! I put it on before work and it doesn't make me look greasy or anything. You could probably use it under make up of you really wanted to, I just haven't tried it yet. My only complaint is the price but I haven't tried anything as good ad this! I've seen Ulta have sales on it every once in a while.
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Reviewed in the United States on August 22, 2020
★★★★★ 5
Soothing, refreshing, and effective for most uses
I found this sunscreen back when it was still reasonable priced ($10 for a bottle this size) and am now completely 100% addicted as the price continues to rise. Sigh. I don't use this anywhere but my face and neck.
Putting this on my face makes me go "ahhhhh". I break out easily, burn easily, and haaaate the feeling of sunscreen. Previously, I used Neutrogena 45 or 55+ ultra-sheer dry touch, and I still use that sometimes when I expect more intense exposure, but the Coola cucumber just feels so much better.
I don't actually know if I would burn in cases where I still use my other 45+ sunscreen since I haven't taken the chance. I use Coola for 30-45 minute pool sessions, and hikes between 30-90 minutes. I haven't trusted it for things like skiing, 3 hour hikes, or boating where you get intense sun and a lot of moisture exposure.
Buy if you want a lightweight, refreshing face sunscreen for walks in the sun, lounging poolside, or mild-moderate hikes.
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Reviewed in the United States on July 10, 2020
★★★★★ 4
Everyday sunblock
It’s an okay sunblock, light weight , and smells good . the only problem is that the expiration date is too soon that is 10/2021
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Reviewed in the United States on May 28, 2021