The Linux kernel is turning 30 this year. That's three decades of pioneering open source software, enabling users to run free software, to learn from the applications they're running, and to share what they've learned with friends. It's argued that without the Linux kernel, the luxuries of open culture and free software we enjoy today may not have surfaced when they have. It's highly improbable that the parts of Apple and Microsoft and Google that are open would be open at all without Linux as the catalyst.
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