IBM has been encouraging developers to build apps using its Watson artificial intelligence system, which it hopes will be a big moneymaker for the company in the future.

On Wednesday, it kicked off its latest push, pledging $5 million in prizes for whoever makes the biggest breakthroughs using Watson by 2020.

“We’re inviting teams from around the world to develop and demonstrate how humans can collaborate with powerful cognitive A.I. technologies capable of solving some of the world’s grand challenges,” the company said.

By grand challenges, it’s thinking big. It lists past achievements like the moon landing, mapping the human genome, and addressing climate change. (That last one might still be up for grabs, by the way).

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