The deepest hole ever dug on Earth is the Kola Superdeep Borehole, which goes almost 6 miles down. But that's still less than 1% of the way to the Earth's core. So, how do scientists study it? The answer: Lasers.

Wake up with Kim every Saturday morning! Grab a cup of coffee and catch up on top tech news, digital tips and how-tos, and highlights of Kim's show.

When you think of intelligence, you might think of how well you score on an IQ test. But many types of intelligence have little to do with knowing facts and figures. When asked the question, "What's the smartest age," we might automatically think of those with more experience — but the answer is not that simple.

When you think of large machines, you probably picture a massive tractor or maybe an enormous science experiment. Think bigger — much, much bigger. How about the size of the entire United States? The world's largest machine is actually the U.S. power grid and how it became one giant machine is an amazing story.

The jet engine is one of the great engineering marvels of our time. It uses compressed air and a fuel source to create an enormous amount of thrust. That has, in turn, allowed us to travel all over the world. But what if you took one of these behemoths and strapped it to a bike? Would it even be rideable?

I don’t trust Big Tech and you shouldn’t, either. You’ve heard me say for years that free email services like Gmail or Yahoo aren’t really free. There’s a big price to pay — your privacy. These free email sites scan, analyze and save details of every email you send and receive, giving Big Tech a very intimate and detailed profile of you so they can easily sell your data to the highest bidder.

That’s why I use StartMail. With StartMail, I can send encrypted emails with one click, even if the recipient doesn’t use encryption. And StartMail never scans or analyzes your emails. Best of all, when you delete an email, it’s gone — forever.