Editor’s note: A version of this story appeared in CNN’s Wonder Theory science newsletter. To get it in your inbox, sign up for free here. Like nostalgia-evoking songs, objects can help us ...

The Hoover Wind Tunnel Bagless Vacuum is a reviewer-loved option for many reasons, and it currently costs just $68—a whopping 60% off its original price of $170. The Hoover is designed with ...