Everything we know is governed by four physical forces, but there is only one of them that is immediately obvious - gravity. Although ludicrously weak compared to the other forces (a tiny magnet can hold up a piece of metal against the gravitational attraction of the whole Earth), gravity permeates our everyday life and being. We begin with humanity's earliest ideas of how we remain stuck to the ground - a significant consideration when you realize that despite the myths, educated people have known the Earth was a sphere since the time of the Ancient Greeks.
Along the way we'll see how the Arabic scholars explained the force of gravity, why Galileo didn't need to drop balls off the tower of Pisa, exactly how Newton came to his conclusions and why he refused to 'frame hypotheses' about gravity.
We will explore the concept of action at a distance, and see how Einstein transformed our understanding of gravitation with general relativity and consider whether the graviton will ever be discovered. We will see how birds, bees and rockets seem to defy gravity, and whether the concept of anti-gravity can move from pure science fiction to possible fact.
Gravity never fails to fascinate...
How we describe the condition of our books
We are very proud of the condition of the books we sell (please read our testimonials to find out more!)
New: Exactly as it says.
As New: Pretty much new but shows small signs of having been read; inside it will be clean without any inscriptions or stamps; might contain a remainder mark.
Very Good: Might have some creases on the spine; no hard cracks; maybe slight forward lean and short inscription inside; perhaps very minor bumping on the corners of the book; inside clean but the page edges might be slightly yellowed.
Good: A few creases on the spine, perhaps a forward lean, bumping on corners or shelfwear; maybe an inscription inside or some shelfwear or a small tear or two on the dustjacket; inside but page edges might be somewhat yellowed.
Fair: In overall good condition, might have a severe forward lean to the spine, an inscription, bumping to corners; one or two folds on the covers and yellowed pages; in exceptional cases these books might contain some library stamps and stickers or have neat sticky tape which was used to fix a short, closed tear.
Poor: We rarely sell poor condition books, unless the books are in demand and difficult to find in a better condition. Poor condition books are still perfect for a good read, all pages will be intact and none threatening to fall out; most probably a reading copy only.