28th February, 10:39 am Feb 28th

I didn't realize that the apple 'sleeping light' pulsed at a human breathing rate - I love these little details.

This was posted on Saturday 28th February, 2026 at 10:39 am Pacific.

Read more posts from February 2026.

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This is the personal website of Cal Henderson, Slack co-founder & CTO.

I give occasional talks, write code and sometimes articles.

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