so

While renewable energy sources are already reducing the need for CO2-emitting, fossil fuel-burning power plants, industrial plants that make intense use of fossil fuels are harder to make sustainable, so flue gas capture is essential.

The behavior spread so far so quickly that scientists considered it unlikely that individual birds across a continent were inventing this trick on their own.

So Chimento and Aplin wanted to know if there was an ingredient that would catalyze social learning, allowing animals to more efficiently realize its rewards.

One tutor was then released into each group, so that their flock mates learned to prefer using one solution over another.

Not only did immigrants see that residents were opening the puzzle box in a new way, but in some groups, the newcomers also discovered that residents scored a superior reward by doing so.