THINK TWICE, my new book, is OUT TODAY! . It's a compilation of the simple puzzles that (almost) everyone gets wrong. How will you get on? #ThinkTwice #MeTwice.

RT @Literacy_Trust: Think your class knows the answer?🤔. 230,000 pupils are already signed up to The Great Big Footy & Booky quiz with @wor….

Are you a Prime Target for puzzles?. @AppleTV.

Quizzers in a queue.

Kindle deal - THINK TWICE is 99p today.

Looking forward to the first square year since 1936.

Only a few hours left at the super low price - dont think twice!.

STILL A FIVER!.

Shave my beard in half this is a v nice surpise! . Dan Ariely is a science legend (who I do not know) and he said v nice things about THINK TWICE. Thanks @danariely !.

🎄🎄My new book is ONLY A FIVER for today and to celebrate my publishers made me a Xmas JPEG 🎄🎄. You can get it here:

It is also available at your local bookshop:.

A liar who always lies says “All my hats are green.”. We can thus conclude that the liar has.

If you want to stock up on any FOOTBALL SCHOOL books for stocking fillers, they seem to be on HUGE discounts on the 'zon. £3 for EPIC HEROES. £4/5 for almost all the others.

Mars attacks.

Pondering a festive purchase? Can I offer my wares. THINK TWICE: Solve the Simple Puzzles (Almost) Everyone Gets Wrong. THE FOOTBALL SCHOOL ENCYCLOPEDIA . Guaranteed to delight and amuse!

Wow, currently #9 on the Kindle Store. Thanks to everyone bought it. and thanks to anyone who will. let's get it into the top 5!.

Ooh, my new book is LESS THAN A QUID on Amazon for today only. That's about 1p per puzzle. Don't think twice about this one!.

Is there a way to encourage voters to respond honestly to pollsters?.

Howdy North America - PUZZLE ME TWICE - my latest book is out today over your way. The UK version THINK TWICE has been out for a month. Full of brilliant counter-intuitive puzzles that you will love getting wrong! Amirite? Get the book and find out!.

A puzzle by @xkcd .