HeartMath
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This product by HeartMath came up once on Tim Ferriss in the episodes we index. That mention was a genuine on-air recommendation, not just a passing reference. The people who brought it up: Kevin Rose. Every occurrence below links to the episode page and to the exact second it was said on YouTube.
“I'm telling you this is the coolest device I have owned in a while and you lock into this coherence mode as you do this breathing”— Kevin Rose
The guest here is Kevin Rose: Tech investor, entrepreneur (founder of Digg), longtime friend and co-host of The Random Show with Tim Ferriss; meditation and biohacking enthusiast. Tim Ferriss and Kevin Rose riff on Zen retreats, vagus nerve stimulation, supplements, balance training, and Alzheimer's experiments.