Let Google maintain the core files and provide the bandwidth to serve them.
Google is leading the way in helping MooTools developers save time in the arenas of development, maintenance, and hosting by working together with the MooTools developers to host and deliver compressed and uncompressed versions of MooTools to our website visitors. Hosting on their servers eliminates the resources required to host, bandwidth required to deliver, and developer time required to maintain the requested, fully patched, and up-to-date version.
Usually we link to a minor version of a library to prevent major version changes that could cause unexpected behavior in our production code.
Google API keys that are ...