A little creativity and confidence makes this cookie feel as smart as the clever cupcakes and rolls that also live in the bakery.

We're all getting older every day, and scientific research has shown that starting in our twenties, some brain functions begin a linear decline. Even if we avoid diseases such as Alzheimer's and Parkinson's, parts of the brain inevitably shrink, replicating cells become damaged, and fluid processing skills such as multitasking and episodic memory worsen. But is old age all doom and gloom? Are we destined for senescence once we?re barely out of adolescence? The...