Music is one of those universal things that bring people together. It is an art form of and for the masses, and a song can be a time capsule of both personal and collective memory.

The musical instrument that most readily carries memory and feeling across generations — and without a doubt the rock star of instruments — is the guitar. From the blues and rockabilly riffs of Chuck Berry and Buddy Holly to the explosive sounds of heavy metal and grunge, guitars have defined music for over a century.

It’s easy to see why people take the guitar very seriously. (There’s even an annual Air Guitar World Championship. Read about it in our book Bizarre Competitions.)

A talented guitarist can bring their band world renown, and some of the greatest guitarists are also great collectors of guitars, including Keith Richards and Neil Young.

“Pure mathematics is, in its way, the poetry of logical ideas.”
— Albert Einstein

Today is the birthday of everyone’s favourite wild-haired genius Albert Einstein as well as Pi Day — the annual celebration of the mathematical constant π, the first three digits of which are 3, 1, and 4.

To celebrate these two occasions, we’re not only planning to eat some pie (check out the delicious recipe for Killer Pecan Pie in Clueless in the Kitchen for inspiration) but also on brushing up on our math knowledge with great books on the subject.

Whether you’re a hardcore math enthusiast or you’re just interested in how mathematical theories apply to everyday life, we have a book for you. Check out our reading recommendations, and then take our quiz to see how much you know about the history of math.

Today is National Trivia Day, and we're here to test your knowledge of the world. We've pulled together ten of the toughest trivia questions from our Infographic Guides series, including questions about science, history, music, and more. 

How many can you get right?

TAKE THE QUIZ.

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