Can you crack these mental nuts? The Almanac's tantalizing “Brainteaser of the Day” app serves up not just one or two kinds of puzzles, but also forgotten types such as metagrams, conundrums, rebuses, charades, enigmas, anagrams, and riddles. Many are old-fashioned puzzlers that kept your grandparents up at night, and they're as challenging today as they were up to 200 years ago, when they appeared in The Old Farmer's Almanac. Everyone in the family from ages 8 to 80 (or more!) will find something intriguing. Have fun-every day!