Memory lapses aren't always caused by Alzheimer's. Depression, infections or even vitamin deficiencies may be the reason. The post 12 Memory Problems that Look Like Alzheimer’s—But Aren’t ...

Memory champions' brains have some differences from the average person's. But people can train their brains to develop the same markers.

But what does a memory really look like? How does your brain take information from the outside world and cache it for later retrieval?

A study published Thursday in the journal Cell suggests that they are also critical to the process of making memories. A form of glucose called glycogen is stored inside these spider-like cells.

Neuroscientists Daniela Schiller says every time you recall a memory, it changes, and that can be a useful thing.