The next time someone asks you where the biggest ocean is, point them toward Jupiter. While earth harbours about 320 million cubic miles(1,333 cubic km)of water, our planet is practically a desert compared to the rest of the Solar System.

    A moon of Jupiter called Europa, for example, which is roughly the size of our own Moon, likely hides a subsurface ocean with more than twice as much water as there is on Earth.

    Yet even that pales into insignificance in comparison to Europa's neighbour Ganymede; more than 30 times as much water as our home planet is thought to reside there as liquid and ice.

    And scientists keep finding more water wherever they look. On September 28, researchers reported that Dione — a small moon of Saturn — probably has a subsurface ocean, too.

    To see just how Earth stacks up against other ocean worlds, Business Insider contacted Steve Vance, a planetary scientist at NASA's Jet Propulsion Laboratory who's calculated the numbers on just how much water might be out there.

    In order of how much water they have, from the least to the most, they are: Enceladus, Dione, Earth, Europa, Pluto, Triton, Callisto, Titan, and Ganymede. Mimas, a moon of Saturn, and Ceres, the largest asteroid in the Solar System, are also thought to have subsurface oceans —but scientists aren't yet sure how big each one might be.

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    Standing in the shower waiting for the water to het up could be a thing of the past, along with all the wasted water. Three and a half years ago, Lindy Honeychurch, a thirty-year-old Australian full-time mum living on a farm outside Launceston, didn't consider herself a very good water saver. Neither did her partner who often complained about it with good reasons. Their farm had to rely on tank water and solar power, which meant water had to be trucked in if he tank water ran out in summer.

    “I looked at where I could save because I could lead an easier life without the complaint,” she said. Modeling her idea on a car thermostat(恒温器), Lindy used her kids' magnetic(磁的)drawing board to design a device that diverts the cold water back down the hot water pipe. “The first aim when I started designing was to keep it really small and simple without having to use power. I wanted to keep it as something that everyone could use,” said Lindy.

    She got a patent for her design and took it to some engineers to have it tested out. At first, even though the engineers were amazed that she wasn't an engineer, she said she sometimes found it hard to be taken seriously. “My age was a real factor because in the plumbing(管路系统)and manufacturing industries you're dealing with people who've got a lot of experiences,” she said. But the engineers soon saw the potential of her design, which she estimated would save average families between 14,000 to 22,000 liters per year.” when you transfer that to the dollar savings on tank water that you have to buy, it can be a saving of $600 per year,” said Lindy.

    Armed with positive feedback from engineers and people using rainwater tanks, her design proved a great success. Soon she found a manufacturer early this year, and completed a state government commercial ready course to help her research, her markets and distribution channels. With an Australian Standard for her device just approved, she's about to start manufacturing and wishes to see her products on the shelves within the next few months. Once that happens, Lindy plans to return to being a full-time mum.

    Here is a record of the discussion about AI (artificial intelligence) conducted by several scientists:

    Scientist A: I would say that we are quite a long way off developing the AI, though I do think it will happen within the next thirty or forty years. We will probably remain in control of technology and it will help us solve many of the world's problems. However, no one really knows what will happen if machines become more intelligent than humans. They may help us, ignore us or destroy us. I tend to believe AI will have a positive influence on our future lives, but whether that is true will be partly up to us.

    Scientist B: I have to admit that the potential consequences of creating something that can match or go beyond human intelligence frighten me. Even now, scientists are teaching computers how to learn on their own. At some point in the near future, their intelligence may well take off and develop at an ever-increasing speed. Human beings evolve biologically very slowly and we would be quickly substituted. In the short term, there is the danger that robots will take over millions of human jobs, creating a large underclass of unemployed people. This could mean large-scale poverty and social unrest. In the long term machines might decide the world would be better without humans.

    Scientist C: I'm a member of the Campaign to Stop Killer Robots. Forget the movie image of a terrifying Terminator stamping on human skulls and think of what's happening right now: military machines like drones, gun turrets and sentry robots are already being used to kill with very little human input. The next step will be autonomous “murderbots” following orders but finally deciding who to kill on their own. It seems clear to me that this would be extremely dangerous for humans. We need to be very cautious indeed about what we ask machines to do.

    One Moore Elementary school teacher is showing students the importance of communication through “shout-outs”. Third Grade Moore Elementary teacher Lindsey Winders said a shout-out is a compliment（称赞）that students can say or write down. “Like, 'hey I noticed you doing a really great job solving your math facts yesterday. I wanted to make sure you know that I saw you do that,” Winders said.

    Winders said she makes sure she is giving shout-outs to her students every day. “I might write them a sticky note, or write them a quick little note in their plans. I might just say it to them on their way into the classroom or on their way out of the classroom, but most importantly I try to do it every day,” Winders said.

    In addition to the compliments, Winders has the students greet each other every morning during morning meeting. She will have students give examples to the class of how to communicate in different settings. Third grade student Nayelli Moranchel said she has given at least six shout outs this year. “It makes me happy, because they always write something back,” Moranchel said.

    Recently, Winders took it one step further and wrote a personalized note on each of her students' desk. “In our classroom, sometimes it can be challenging for me to give a compliment or a shout out to each and every one of them in a way that feels equal and valuable at the same time. So I thought what's a better way to be able to do that than leaving a note on their desk that can stay for as long as they want it.” Winders said.

    Winders said it is encouraging when she sees her students copy the act, and give each other compliments without her guidance.

    Memory, they say, is a matter of practice and exercise. If you have the wish and really make a conscious effort, then you can quite easily improve your ability to remember things. But even if you are successful, there are times when your memory seems to play tricks on you.

    Sometimes you remember things that really did not happen. One morning last week, for example, I got up and found that I had left the front door unlocked all night, yet I clearly remember locking it carefully the night before.

    Memory "tricks" work the other way as well. Once in a while, you remember not doing something, and then find out that you did. One day last month, for example, I was sitting in a barber shop waiting for my turn to get a haircut, and suddenly I realized that I had got a haircut two days before at the barber shop across the street from my office.

    We always seem to find something funny and amusing in incidents caused by people's forgetfulness or absent -mindedness. Stories about absent -minded professors have been told for years, and we never get tired of hearing new ones. Unfortunately, however, absent -mindedness is not always funny. There are times when "tricks" of our memory can cause us great trouble.

If you really want a taste of the everyday swing of Dutch life, a bike tour through Amsterdam is the way to go.

What is included in an Amsterdam bike tour

The bicycle is of course provided and included in the price of the tour. Some tours offer coffee and tea after the tour finishes. Every tour especially has its own theme and route. You can compare them by visiting webpages dedicated to a particular tour.

A tour itself is a beautiful experience. Amsterdam's architecture, markets, bridges, plazas and street atmosphere are memorable and comfortable to see from a bike seat. See them like most citizens of Amsterdam do.

Amsterdam bicycle tour basics

These tours are usually between one and two hours long. They are guided by friendly and knowledgeable tour guides who are well capable in Amsterdam information. What's more, the tour guides usually know many languages and are used to overcoming language barriers(障碍).

Important during the bicycle tour of Amsterdam

Please don't become so Dutch that you ignore( 忽视) the traffic laws. It is a fact that some Amsterdammers often cross a street or a bridge when they feel like doing it. That is why staying alert (警惕的) and a little bit of biking experience can help you to go through the small city streets during an Amsterdam bike tour. Also, unless you are 100% sure that the weather will be sunny, you'd better bring a jacket. When you start moving on the bike, the wet Amsterdam's air can get quite cold.