It is 'the earliest piece of writing that uses the word America,' Julian Wilson, a senior specialist in Christie's books department, said.
Google Earth partnered with environmental sensor network firm Aclima to map air pollution across California, with the hopes of using the information to help build smarter, more sustainable cities.
They used Google Street View cars equipped with air quality sensors, and are now sharing some of their findings for the three California regions they've mapped: The San Francisco Bay Area, Los Angeles, and California's Central Valley.
Make App digitally 'removes' all trace of cosmetics from photographs, and it's been road tested on some of the most flawless faces on the red carpet, including (clockwise from top left) the Duchess of Cambridge, singer Cheryl, former Bake Off star Candice Brown, and Victoria Beckham.
It can also be used to 'add' makeup, lighten skin and minimise redness.
Built in the third century, the London Mithraeum was discovered by chance in 1954 and became an instant public sensation, with up to 30,000 people per day queueing to see it.