We all do it. Misplace those car keys, can't remember where we put our phone, have trouble finding out car in a parking lot. Glad we have tracking apps.

You may not have given much though to the weight of your keys, but you should. We asked an expert if a heavy car key chain is ...

I had no idea how to lock the car without a key. Maybe it locks itself when you exit and close the door? I did that, walked away…and returned an hour later to find the car was still unlocked.