Third Sphere’s Substack
Miela MayerWorking for founders transforming global systems. Cross posting with https://medium.com/third-sphere See our newsletter here: https://thirdsphere.com/updates/
| Platform |  | Pricing | Only free issues | Publishes | Weekly |
|---|---|---|---|---|---|
| Issues | 10 | Founded | a year ago | Last Issue | 2 months ago |
| Active | |||||
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thirdsphere.substack.comLatest Issues
Why We Invested in Return To Vendor: How Stretchable Nylon is Solving Fashion’s Biggest Recycling Problem
Over $1 trillion worth of textiles are wasted each year. And here’s the part that really stings: just 1% of global textiles can actually be recycled. We don’t lack recycling infrastructure or consumer willingness, we’re limited by chemistry...
Why We Invested in Focal - Electrifying Heating One Person at a Time
“Part of Focal’s mission is to limit energy use. We spend too much money heating entire spaces, especially outside. This system heats people directly. It’s just a cleaner, smarter way to think about comfort.”
- Keith Cox | co-founde...
Speedstrap Playbook - Chapter 2
Living version of this Speedstrap Playbook here - comments welcome.
“Venture Capital doesn’t scale with more money.”
- Roelof Botha, October 2025 on Uncapped.
Playbook Table of Contents
Living version of this Speedstra...
Why We Invested in AccessGrid
When was the last time you thought about the plastic card or fob jangling on your keyring? Probably never. Yet those seemingly innocuous credentials represent a surprisingly stubborn problem: billions of PVC cards manufactured annually, mil...
SpeedStrap Playbook - Chapter 1
Working version of our extended Speedstrap Playbook here - this is a living document and comments are welcome.
“...my gut is we have a problem. The system as it exists today promotes less liquidity, less traditional, high quality c...
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Just a gal perusing and sense making | Climate Tech @Third Sphere | Into making things cooler
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