Nasa has announced that it has found evidence of flowing water on Mars. Scientists have long speculated that Recurring Slope Lineae -- or dark patches -- on Mars were made up of briny water but the new findings prove that those patches are caused by liquid water, which it has established by finding hydrated salts. Several hundred camped outside the London store in Covent Garden. The 6s will have new features like a vastly improved camera and a pressure-sensitive "3D Touch" display

Let's suppose you've agreed to a rather odd travel program, where you're going to be suddenly transported to a randomly selected country, and your job is to figure out where you end up. So, here you are in some new country, and all countries are equally likely. You make a list of places and probabilities that you're in those places (all equally likely at about 1/200 for 200 countries). You look around and appear to be in a restaurant. Some countries have more restaurants (per capita/per land area) than others, so you decrease the odds that you're in Algeria or Sudan and increase the odds that you're in Singapore or other high-restaurant-density places. That is, you just multiply the probability that you were in a country with the probability of finding oneself in a restaurant in that country, given that one were already in the country, to obtain the new probability. After a few moments, the waitress brings you sushi, so you decrease the odds for Tajikistan and Paraguay and correspondingly increase the odds on Japan, Taiwan, and such places where sushi restaurants are relatively common. You pick up the chopsticks and try the sushi, discovering that it's excellent. Japan is now by far the most likely place, and though it's still possible that you're in the United States, it's not nearly as likely (sadly for the US). Those "probabilities" are getting really hard to read with all those zeros in front. All that matters is the relatively likelihood, so perhaps you scale that last column by the sum of the whole column. Now it's a probability again, and it looks something like this: Now that you're pretty sure it's Japan, you make a new list of places inside Japan to see if you can continue to narrow it down. You write out Fukuoka, Osaka, Nagoya, Hamamatsu, Tokyo, Sendai, Sapporo, etc., all equally likely (and maybe keep Taiwan too, just in case). Now the waitress brings unagi. You can get unagi anywhere, but it's much more common in Hamamatsu, so you increase the odds on Hamamatsu and slightly decrease the odds everywhere else. By continuing in this manner, you may eventually be able to find that you're eating at a delicious restaurant in Hamamatsu Station -- a rather lucky random draw.

Your next trip could be planned by... artificial intelligence? A new startup called Lola aims to revolutionize the concept of travel agents by making trip booking as easy as texting a friend. The company, which was started by Kayak founder Paul English, officially launches for iPhones Thursday, with a small team of travel bookers who will rely on super-powered artificial intelligence algorithms that will help them manage as many as hundreds of clients at once. Here's how it works: After setting up an account--and punching in credit card details--Lola users can simply message a representative through the app, whether they need a simple round trip to Chicago or want to plan a weeklong hiking expedition through Indonesia. While a traditional booking site would make you type in dates, preferences, and countless other parameters, Lola promises to simplify the process by letting users make requests in conversational language: You might type "need a flight to O'Hare next weekend" instead of punching info into little boxes.

You probably didn't consider basing your Kentucky Derby bets on artificial intelligence -- but maybe you should have. The artificial intelligence company Unanimous tested its new software platform, UNU, on last weekend's Kentucky Derby, as reported by TechRepublic. Twenty participants, convened by the company, first used the software to narrow the field of 20 horses down to four top picks. The participants then used UNU to predict the winning order -- and it turned out to be 100 percent correct. "I placed my 1 bet on the race at the Derby on Saturday and made 542.10 -- the odds of winning the superfecta [the top 4 finishers in order] were 540-1," TechRepublic reporter Hope Reese wrote.

Many travel agencies are working to better integrate mobile messaging into the travel booking process for clients. But a new service from online travel veterans is looking to take a technology-first approach to providing concierge-like service in the online travel booking space. Lola launches today on the Apple App Store, combining augmented chat with artificial intelligence and a staff of travel agents and customer service specialists to book travel for users. An Android-compatible version will follow before the end of the year. Kayak co-founder Paul English's newest project pairs deep-learning artificial intelligence technology with travel agents and customer service experts in order to present users with a more organic travel booking experience than has previously been available to both leisure and business travelers.

You may consider yourself an awesome drone pilot, able to fly skillfully at breakneck speed while dodging hazardous obstacles with a few nimble finger movements, but how would you deal with a steamed up eagle, or a chimp with a stick? Filming a historical reenactment at a recent festival in the Lipetsk region in central Russia, some poor drone pilot clearly got a little too close to the action. Watch carefully and you can see the spear-wielding guy on the ground, in full period costume, launch his weapon skyward. We have to say, it was an impressive throw, scoring as it did a perfect hit on the flying machine, sending it crashing to the ground. The video comes courtesy of Russia Today, though the news site offers few details of the reenactment event, or, more importantly, the drone calamity.

Filmmaker Duncan Jones says his dad, David Bowie, inspired him to make movies. The director of "Moon" and "Source Code" talked about his late father Wednesday at the Los Angeles premiere of Jones' latest film, the video-game adaptation "Warcraft." Bowie died in January at age 69. "My dad was obviously prolific in music, but he also acted and I think I had the most fun when we were on film sets... I think I got the (directing) bug back then," Jones said.

Drones have emerged in recent years as one of the hottest modern technologies. They're used for purposes as varied as monitoring crop health and tracking construction projects, endangered animals and missing persons. A reenactor at Rusborg in Lipetsk, Russia, threw a spear at a drone filming the festival devoted to the Middle Ages, causing the quadcopter to tumble to the ground. Pavel Semyonov, an organizer of the event, later explained on social media that at the time of the drone crash, participants were full of adrenaline because of a nearby weapons contest. The man who caused the drone to crash apologized for the incident and compensated the drone owner for the damaged property, according to Semyonov and the company shooting the video.

Nasa has announced that it has found evidence of flowing water on Mars. Scientists have long speculated that Recurring Slope Lineae -- or dark patches -- on Mars were made up of briny water but the new findings prove that those patches are caused by liquid water, which it has established by finding hydrated salts. Several hundred camped outside the London store in Covent Garden. The 6s will have new features like a vastly improved camera and a pressure-sensitive "3D Touch" display

Every child gets a vision and hearing check in school on a regular basis. Dr. Moshe Fried, an Israeli plastic surgeon, believes an annual skin check is necessary as well, starting in the teens. This is why he agreed to be the medical consultant for Emerald Medical Applications' DermaCompare, a free smartphone app that can detect changes in marks and moles over time. The app alerts the user to changes that ought to be screened for cancer. "The skin is the biggest organ in the body," said Fried.