# Positive What If: A Time Machine for Optimists

- **Event:** [Gemini 3 Paris Hackathon](https://cerebralvalley.ai/e/gemini-3-paris-hackathon)
- **When:** Sat, Mar 14 at 9:00 AM – 10:00 PM (GMT+1)
- **Where:** Location TBA
- **Team:** [Nabila Putri Salsabila](https://cerebralvalley.ai/u/nabputsal)
- **GitHub:** https://github.com/nabputsal/gemini-hackathon
- **Demo video:** https://drive.google.com/drive/folders/19EoZciwZ_6dI0CrwKeBcl4HNZ_-G0NZq?usp=sharing
- **Gallery:** https://cerebralvalley.ai/e/gemini-3-paris-hackathon/hackathon/gallery
- **Page:** https://cerebralvalley.ai/e/gemini-3-paris-hackathon/hackathon/gallery/21

I work in climate policy. Most days bring bad news: missed targets, stalled legislation, another funding cut. After a while, the setbacks become numbing. Then I saw a short video asking: what if it all goes right? I couldn’t stop thinking about it.

So I built Positive What If, a time machine for optimists.

Users choose a future they care about: universal basic income, staying under 1.5 °C, or cities designed for people, not cars. The app loads ~50k tokens of curated research and generates a narrative set in a real city and decade: what worked, what failed, the trade-offs, and feasibility scores across four dimensions. Every claim is cited. It also generates before-and-after street images and a shareable postcard from that future.

I built it because I was tired of imagining only the worst.

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Markdown version of https://cerebralvalley.ai/e/gemini-3-paris-hackathon/hackathon/gallery/21. Site index for agents: https://cerebralvalley.ai/llms.txt · full text: https://cerebralvalley.ai/llms-full.txt