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“Given the positive feedback and reviews of my artwork and memoir, I was expecting to obtain paid speaking engagements and paid appearances, but that has not happened,” Biden wrote.

“It’s a very harsh learning environment,” Mace explained, with lots of unreliable “positive feedback.”

And a weaker biological carbon pump is less able to draw down atmospheric carbon into the ocean, “which means we may be underestimating future temperatures,” Crichton said, as this is a positive feedback to warming.

Additionally, parents offered their children more encouragement and positive feedback when the task was framed as a learning opportunity.

Their steps wear down the grass further, which makes the visual cue stronger and creates a positive feedback loop.