A new introduction to the great philosopher’s work foregrounds its revolutionary nature and far-reaching impact.

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They have been there for millennia, before the earth was born, taking light years to reach us. For all you know, that shining ...

Ibn Al Haytham's 1,000-year-old work inspired generations of European philosophers, physicists and astronomers - but his road to recognition was a rocky one ...

Quantum physics books can seem overwhelming, but they don’t have to be. Whether you’re just starting out or you’ve been curious for a while, the right book can make all the difference. This list ...

French Creek State Park in Elverson, Pennsylvania, is that rare place where you can actually hear yourself think. You know those moments when you’re stuck in traffic, or waiting in an endless checkout ...

In the heart of Cuyahoga Falls sits a bargain hunter’s nirvana that defies the laws of retail physics – a place where amazing finds and rock-bottom prices create a shopping experience that borders on ...

Investopedia contributors come from a range of backgrounds, and over 25 years there have been thousands of expert writers and editors who have contributed. Robert Kelly is managing director of XTS ...