I just checked out Union Build's @union_build  website union.build/learn and thought I'd share what I learned. 

Their goal is to make different blockchains work together better, which is a huge problem right now.

Basically, they're building something called the "Union Network" that connects different chains without creating yet another blockchain. Instead, they use what they call "messaging protocols" to let information flow between existing chains.

What caught my eye was their focus on speed - they claim their system can send messages between chains in less than a second, which would be pretty impressive if true. Most cross-chain stuff I've tried takes forever.

They talk about using special math proofs (zero-knowledge proofs) for security, though honestly I don't fully understand how that works. But the idea is to make transactions both fast and secure.

The website mentions partnerships with some decent projects like Arbitrum and Polygon. They also have a dashboard and some apps you can try out.