That's a copy of Get a Grip on Physics there on the floorboard. According to Britain's The Independent:
The book deals with the basics of physics, from its earliest developments to cosmology – although there is no mention of what happens when you shunt a heavy SUV into a stationary fire hydrant.[...]
The book was 2,268th position on the Amazon sales list, up from 396,224th the previous day.If these numbers are for real, and that's a big if, I wonder how many of the recently purchased copies of Get a Grip on Physics will actually be read. I suspect the percentage read will be very low - not that Mr. Gribbin is likely to care.