"It is not possible to step into the same river twice." 

When you step into a river, you change that river by being in it.

Neither you, nor the river, are ever the same again. And so it goes, moment by moment, with memory.

This phrase is a loose translation attributed to Heraclitus, a Greek philospher (c.535 – c.475 BCE). 

We fundamentally change our body, and therefore memory, as we respond to our environments.

All of the products here enhance some aspect of your memory.  Learn why below.