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Why fire smoke constantly follows you
If you’ve ever gathered around a campfire, you might have noticed the smoke seems to follow you no matter where you are. No, it’s not your bad luck — there’s actually a scientific reason behind it.
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How do oysters make pearls?
Pearls are iridescent spheres made of the same materials as an oyster’s shell. So, why are they so much more beautiful than the shell itself? It all comes down to the life cycle of an oyster.
How humans solved the greatest riddle of navigation
When you look at a globe, you see horizontal and vertical lines crisscrossing the entire sphere. Those are latitude and longitude lines and they have helped us explore the Earth over the last 500 years. In this video, you’ll learn how to find your own latitude and longitude at home without using Google. Cool!
Why is the Vatican's giant telescope located in Arizona?
Here’s a fun fact for your next holiday get together: The Catholic church is a leading force in space exploration. How? The church funds a massive space telescope in the middle of the Arizona desert. Researchers have used it to make countless discoveries and better understand the universe. But why is it in Arizona?
Historic weapons that were complete failures
War has been a constant throughout human history. In some cases, war led to ingenious innovation — and other times, it led to abject failure. In this video, go back in time to see weapons once lauded as the next game-changers. In reality, they were never used in combat or failed once deployed.
Why the US Army's camouflage was a big mistake
Camouflage has been part of military strategy for millennia. It allows soldiers to hide in plain sight and attack without being seen. But a little over 20 years ago, the U.S. changed its military camouflage and everyone realized pretty quickly that it was a big mistake.
Spider eyes are more powerful than you think
Spiders are some of the smallest invertebrates on Earth, but these tiny creatures have a remarkable skill. They can see better than most animals 10 times their size. The trick is that their eyes are tiny little telescopes that allow them to focus on things in extraordinary detail. Some scientists even claim spiders can see the details of the moon. The real question is, why do they need to be able to do this?
What causes sleepwalking?
Most of us know someone or are someone who occasionally gets up in the middle of the night while they are sleeping and walks around the house or does something strange. This is called sleepwalking, and around 4% of US adults have reported this happening to them. But why does this happen, and what can we do to prevent it?