Do you love staying at a nice hotel when you're on a trip? White bedsheets, tasty breakfasts, nice view from your room. But what if I tell you hotels hide some unpleasant secrets behind their walls? Built-in hidden cameras, dirty TV remotes, germy bedspreads and so much more... Here're hotel secrets you wanted to know but were afraid to ask.

There are several main reasons why people confront you about inappropriate things. Sometimes they don't realize that it's unsuitable. Yup, some people genuinely think that there's nothing wrong with asking you about your weight or when will you finally get married. Some people are brutally honest by nature. They're not used to keeping their mouth shut. There are people who are just angry! And this type of personality really does want to hurt you. So, let's imagine you're hanging out with your friends, laughing, and having a great time, when someone suddenly asks you the rudest question ever. What should you do? Don't worry, we know exactly how you can become the king or queen of witty comebacks!

Have you ever wondered what color is the Moon? Yellow is the most popular answer, but in fact, our Sun contains absolutely all the waves of the light spectrum. It’s simultaneously red, blue, green, yellow – you name it. But what would happen if the Sun had a different color? If it was red, the whole world would look like it does during sunsets. And what if the Sun was green?

We're used to the fact that space is cold, but our Universe is actually getting hotter. Scientists found that the temperature of a gas in space has gone up more than 10 times in the last 10 billion years. There are many mechanisms that help to heat up the matter in the Universe, and they could go crazy if space warms up. Active stars, colliding galaxies, stellar cataclysms, black holes, neutron stars - the Universe has so many sources of energy. So, will this change in temperature lead to a catastrophe?

If you head to Luzon Island in the Philippines, you’ll find Callao Cave hidden in the jungle. "What's so special about an old cave?" you may ask. Well, this is exactly where archeologists discovered a previously unknown ancient species related to us humans! This human-like species was dubbed Homo luzonensis in honor of the island it was discovered on. Adults were probably quite short, about 4 feet (1.2 m) tall. The scientists assumed that this species led a mixed lifestyle, what with their ability to both climb trees and walk on two legs. However, the finding seems to raise more questions than it answers...

If you've always been interested in outer space, here's news for you: astronomers have recently found a potentially habitable planet! It's called Barnard’s Star B. It has slightly more than 24 hours in a day, and it’s always sunny there no matter what. Actually, it's really cold there, but simple lifeforms can develop and survive in these conditions!

The titan of the sea, the great unsinkable ship that sank – over a century later, the mystery of the Titanic is still being studied to this day. Only a third of the ship’s passengers survived, while over 1,500 lost their lives. But out of all those casualties, only 340 bodies were recovered. So, the question remains: what happened to the remaining 1,160?

Wasps, bees, hornets - all of them make buzzing noises and you don't want neither of them around your house. Most people are wary of bees but hornets are a different story. Thanks to their sheer size and ability to sting you more than once, these insects can seriously ruin your day. Imagine thousands of them covering your backyard... Sounds like a real nightmare! These large insect colonies won't let you sleep at night.

In 1911 the rail company “Zanetti” offered well-off Italians a free trial ride on their new train. The passengers were enjoying their ride making small talk and enjoying their refreshments. One of the sites they were looking forward to was a new tunnel that went through a mountain. It was one of the longest ever built at the time. If only they knew they would never come back... Imagine traveling on a train that is actually a time machine. The 106 passengers and crew of the Zanetti train probably would’ve thought twice before they embarked on their adventure, had they known that. Just like the passengers of the “Titanic,” which set off for its first and last cruise almost a year later, they never reached their destination. The difference, though, is that no one knows what happened to the train…

Elon Musk. Warren Buffet. Mark Zuckerberg. You interested in joining the club of insanely rich? Everybody wants to be successful. However, not many actually make it a reality. So if you wanna start counting your billions, you first gotta start thinking like a millionaire and adopt the millionaire mindset.

Things work differently in space: the gravity, vacuum and temperature all influence the objects in space. What if we decided to conduct an experiment and send food to space before eating it? We've prepared the most delicious garlic bread and it's ready to travel! We get our weather balloon ready and launch the garlic bread to the sky. We wipe the tears from our cheeks as we watch it disappear beyond the clouds. The balloon will endure temperatures as cold as -90° C, meaning we'd better have a microwave on hand should it make its way back to us... Are you ready to witness this epic flight?

How to stay safe while traveling? Now and then magazines, newspapers, and websites publish lists of the safest and the most dangerous travel destinations. But in fact, there’s always a chance of being robbed or attacked in any country in the world. When you’re unfamiliar with your surroundings, it can make you vulnerable to people looking to take advantage of you. Before going on a trip to another city or country, it’s better to consider your safety in advance. Luckily, there are some great hacks you can use to make your travels safe and worry-free, like putting a glass on the door handle of your hotel room!

NYC has about 40 islands. And among those, there’s one that’s so confidential that you can't even visit it! Mystery worth solving, don't you think? We’re about to take a trip to the hush-hush New York island known as U Thant. You’ll definitely be surprised by its interesting history...

Do you think people have pretty much gotten the hang of how things work on Earth? For example, we know that islands don’t just pop up overnight and they definitely don’t move. So when they do, we’re left scrambling for answers. Here are the most bizarre moving islands that had researchers stumped! Scientists needed to study this thing up close. When they approached the mysterious island, they were amazed to find that it wasn’t a solid piece of land at all! It was a giant mass of rocks floating on the surface of the water. And it really was humungous, about 300 miles long and 30 miles wide, a lot bigger than Jamaica, in fact. And this layer of floating rocks was about 2 feet thick.Do you think people have pretty much gotten the hang of how things work on Earth? For example, we know that islands don’t just pop up overnight and they definitely don’t move. So when they do, we’re left scrambling for answers. Here are the most bizarre moving islands that had researchers stumped! Scientists needed to study this thing up close. When they approached the mysterious island, they were amazed to find that it wasn’t a solid piece of land at all! It was a giant mass of rocks floating on the surface of the water. And it really was humungous, about 300 miles long and 30 miles wide, a lot bigger than Jamaica, in fact. And this layer of floating rocks was about 2 feet thick.

Being a scientist is fun: you conduct new experiments every day (some of them are totally crazy!). And all these experiments can prove incredible facts, and we chose those we considered the most amazing and unbelievable.

If you compare some of the photographs which can be found on NASA’s website, you can really see how human beings have changed the appearance of our world over the years. The time difference between these images ranges from five to 100 years. Incredible stuff.

Is time travel possible? Do you know who made those strange symbols in the Amazon rainforest? Maybe, aliens did? We’re going to tell you about 13 mysterious phenomena that would send cold chills down your spine.

Have you ever looked up at the Moon and then noticed a smiling face there? And the next night it was different. There're places where people see the shape of a rabbit on the Moon. What does that picture on our satellite depend on? Here's why some people see a smiling face on the Moon and others see different things. This video is full of space things you may not have learned at school.

Have you ever wondered how soda bottles keep that refreshing fizz for that long? Well, they have a little plastic ring fastened to the lid. They place it there to keep the gas from escaping and making the soda go flat, even if you shake it around in your bag the whole day. Cotton pads have two sides, and if you take the time to look at them carefully, they're actually different in texture. Many other things you use every day without paying special attention to them have their own stories and secrets.

To be fair, about 80% of all flights are ON time — that is, within 15 minutes of the scheduled time. The other 20% are delayed, and it might seem a huge number, but consider this: a commercial flight is not like hopping into a car and driving away. It’s an extremely serious operation that requires lots of coordinated work from hundreds of people. Just recall how many steps do you, as a passenger, need to take to get on board!

Sleep is super-duper important! It gives your body much-needed rest and recovery. It allows your brain to work at its fullest. But sometimes you feel sleepy right after you wake up and even for most of the day. Any ideas why this happens to you more often than not? No, it’s not because of a lack of sleep. It’s because you keep hitting that snooze button like it’s your job!

For many years, literature and movies have made us believe that a typical happy couple is comprised of a younger woman with an older man. Today, however, people are more open-minded and things like age difference don’t play a big role anymore. And one study showed that men aged 20 to 29 prefer older women these days. Let’s see what makes them so happy together!

Where did we come from? Where are we headed? What is our world? Are we alone in the universe? When the mental gears really start moving, people can come up with theories that are downright terrifying! In this video, you'll learn about 13 of the scariest theories that’ll make you question everything you thought you knew about your reality.