Apple has a secret research team — Gurman
The XDG team, originally led by the late Bill Athas, is primarily focused on the glucose work, but also developing next-generation display technology, AI, and features for AR/VR headsets. The group is considered a startup within Apple and consists of only a few hundred people, mostly engineers and scientists. They are granted vast financial resources and have already had some successes with their developments being featured in Apple products. Though the team is highly classified, and people working on different projects cannot communicate with each other about their work. They are, however, grouped by skill sets, allowing the same engineer to work on multiple initiatives that fit their specialties.