John Harper, the creator of Core Animation signed by Facebook

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The entry and exit of personnel in any company is normal. Sure some movements are more important than others, by position held by or for their contributions. The contribution of John Harper was important although many may be a complete stranger. He was responsible for the design and implementation of Core Animation on the iPhone debut in 2007

Apple wants to raise awareness among their employees

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Apple has taken seriously its celebration of Earth Day. After painting leaves their green apples in all stores, dress their employees with green shirts and launch an advertising campaign with the same voice of Tim Cook, the company sent an email to his employees to care more environmentally in their work environment. 

In that email is the best of the arguments: figures showing facts. If all staff collaborate could save 16,420 bottles and 22 tonnes of plastic if usasen a reusable bottle. And just so you have easy, Apple is giving away one by all workers in Corporate and Retail.

Apple also used the excuse of Earth Day to have an internal concert on campus in Cupertino. Not everything will be responsibilities, of course.