What cool new technologies are you seeing emerge? How do we know we can trust them?

Curious about all, but I'd especially love to see non-AI versions, like:

• New batteries for solar: storing heat in big piles of dirt
• A while back Tommy mentioned cowfart backpacks
• Maybe it's something old for you, but we're not in your field so we don't know about it yet

Even though a lot of what we share won't make it, for a variety of reasons, I always find get an overview of the cool stuff humans are creating really inspiring and hopeful.