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We have NASA to thank for many of the technologies we use in ourdaily lives -- everything from memory foam and freeze-dried food, to sunglasses that protect our eyes against UV light and the cameras in our smartphones. The agency says there are more than 2,000 commercial products out there that were influenced in some way by NASA’s know-how.

Related: NASA Building Telescope 100 Times More Powerful Than Hubble

But the inventions spearheaded in-house aren’t the only ones that are making an impact. Through initiatives like the NASA Innovative Advanced Concepts (NIAC) program and the Small Business Innovation Research/Small Business Technology Transfer (SBIR/SBTT), NASA regularly funds proposals for some seriously impressive tech.

Read on for eight examples of innovators that have inspired the space agency’s confidence.

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From strongholds shrouded in mist to majestic mountain-top structures, these regal photographs of castles across the globe will put you under a spell. Scroll down, and happy exploring!

2. Bled Castle in Slovenia

3. Mont-Saint Michel in France

4. Eltz Castle in Germany

5. Kilchurn Castle in Scotland

6. Methoni Castle in Greece

7. Rocca Calascio in Italy

8. Matsumoto Castle in Japan

9. Chillon Castle in Switzerland

10. Eilean Donan Castle in Scotland

11. Prague Castle in Czech Republic

12. Catherine Palace in Russia

13. Hochosterwitz Castle in Austria

14. Chateau de Chambord in France

15. Corfe Castle in England

16. Bodiam Castle in England

17. Guaita Castle in San Marino

18. Buda Castle in Hungary

19. Castle Santa Catalina in Spain

20. Vyborg Castle in Russia

21. Gyeongbok Palace in South Korea

22. Castillo de Barcience in Spain

23. Bran Castle, or “Dracula’s Castle” in Romania

24. Stalker Castle in Scotland

25. Jal Mahal in India

26. Palácio de Pena in Portugal

27. Osaka Castle in Japan

28. Swallow’s Nest Castle in Crimea

29. Ross Castle in Ireland

Unless you have already tested your friend in many travelings, there is a great chance that they will drive you completely mad if you go on a journey together. And it can happen regardless of how long and well you know each other: chatting to each other in a bar or even working in the same office is absolutely different from spending 24 hours a day together. What if they snore? What if they are ready to walk around the city non-stop for 18 hours? What if they cannot make a decision when you need it?

It depends on the situation and the level of your whateverism, but suchcases can lead your friendship into dangerous territory. You may end up feeling annoyed the whole time of vacation, or even falling out with your friend. Nobody wants that, right? So let us help you with a few things you should consider when planning a vacation with your friend. We hope our tips will let you enjoy your travel adventure despite all the little misunderstandings.

For the rest of us, however, this is an excellent time not to go to Rio. A trip to the Brazilian capital city for the World Cup from June 14-21, including roundtrip airfare from New York and a six-night hotel stay, will cost about $3,800 per person, according to travel booking site Priceline.com.

Rio is a popular tourist destination even when it isn't hosting the biggest sports tournament in the world, and the World Cup has increased demand for flights by 222% and demand for hotels by 306%, according to Kayak.com.

If you're looking for a cheaper summer trip, here are 10 alternatives that offer all the sun and sand without the crowds. (Listed rates are based on packages listed on Priceline.com the week of April 21, 2014. Prices are per person and include airfare from New York City.)

Veneto Hotel Package: $922

Cape Town has mountains, beaches, amazing vineyards and a somber yet inspiring history.

Robben Island, a UNESCO World Heritage Site, offers a glimpse into South Africa's past. Buildings on the island were used as prisons and hospitals for those deemed socially undesirable. The island represents "the triumph of the human spirit, of freedom and of democracy over oppression," according to UNESCO.

Barcelo Tambor Beach Hotel Package: $1,070

Not much needs to be said about Costa Rica, which has been a popular destination for years. There are beaches, there are zip lines through tropical forests, there are turtles ... You'll forget all about Rio as soon as you arrive.

The popularity of this Central American country has made it a prime destination for scoring travel deals.

Panama Marriott Package: $1,187

This summer marks the 100th anniversary of the Panama Canal. What better way to mark the centennial than by visiting one of Central America's most cosmopolitan cities?

In addition to the canal, the city has a rich cultural heritage. (And the beaches aren't bad, either.)

Presidente Intercontinental Cozumel Package: $1,200

The island of Cozumel has snorkeling, sunbathing and the kind of beaches you've been daydreaming about.

Located off the eastern coast of the Yucatán Peninsula in Mexico, Cozumel gets its name from the Mayan "Ah Cuzamil Peten," which translates as the "Island of Swallows."

Radisson Cartagena Ocean Pavilion Package: $1,421

Beautiful architecture and vivid colors are abundant in the city, and the food scene has taken off in recent years, giving tourists a wide variety of culinary experiences to choose from.

JW Marriott Phuket Package: $1,970

Phuket is Thailand’s largest island, offering beaches, deep-sea diving and luxurious resorts.

There are some great surfing spots around the island, and with average temperatures between 80 and 90 degrees Fahrenheit, you won't want to get out of the water.

Radisson Blu Resort & Spa Package: $2,400

The city of Dubrovnik in Croatia has a wall around it that dates back to medieval times. Not only is it historic, it's gorgeous, too.

Holiday Inn Darling Harbour Package: $2,507

Sydney is home to the famous Bondi and Manly Beaches, among others. The iconic Sydney Opera House is also a must-see.

Puente Romano Hotel Package: $2,686

Marbella has long been a choice destination among celebrities and aristocrats, and it's easy to see why.

This Spanish city is situated on the idyllic Mediterranean, between Málaga and Gibraltar. There are more than 20 beaches and summer festivals keep the party going all night long.

Hilton Cairns Package: $2,777

Activities in Cairns are all about enjoying what nature has to offer.

After you go scuba diving in the Great Barrier Reef and hang out with koalas in the Cairns Wildlife Dome, soccer will be the last thing on your mind.

With distinctive colors and artistic designs on the wings and tail, it's easy to see which planes belong to which companies. But large commercial jets also provide ample space for various kinds of promotions, often taking the mostly blank hull of the aircraft and turning it into a flying billboard.