If you’ve ever spotted those colorful, nesting Pyrex mixing bowls at a yard sale or tucked away in your grandma’s kitchen, you might wonder if they’re worth more than just a pretty vintage find. The ...

If you've ever spotted those colorful, nesting Pyrex mixing bowls at a yard sale or tucked away in your grandma's kitchen, you might wonder if they're worth more than just a pretty vintage find. The ...