Are we living in a simulation? The idea that we might be living in a simulated reality has worried us for centuries. Thomas Anderson - otherwise known as Neo - is walking up a flight of stairs when he sees a black cat shake itself and walk past a doorway. Then the moment seems to replay before his eyes. Just a touch of déjà vu, he thinks.

Breakthroughs, discoveries, and DIY tips sent every weekday. Think back to some of your core memories -meeting a spouse, getting a job you really wanted, or finding out someone you loved had died. Some are pretty easy to recall, with vivid details that seem as fresh as the moment itself . Other memories might feel more ambiguous and faded, while the most stubborn ones don't come up at all . A study published today in the journal found that mundane memories get extra sticking power in the brain if they are connected to a significant event.

Kirk Ouimet: Grateful to have the opportunity to speak with you today. Wise Being: Grateful to be able to help you. Kirk Ouimet: I wanted to talk about computers today if that is OK with you. Kirk Ouimet: So I have built computers all of my life. My Dad and I built them together when I was a kid.