Honesty is the best policy. We may agree that admitting mistakes and behaving in a genuine way is the right way to lead our lives, but is there something in our human nature that makes us immoral? For example, in some shops and car parks you can find an honesty box-a box where you pay for something by putting money in it-but it relies on you putting the right amount of cash in. This relies on people being honest and not trying to cheat but it does provide a temptation to get away with not paying the full amount.

    Philip Graves, a psychologist, suggests that this temptation is part of our evolution. He says: “We have evolved with the ability to be dishonest. It's part of our evolutionary psychological make-up-because if we can gain an advantage over the people around us, we have a greater chance of surviving.”

    So why do we place such importance on being honest if we benefit from being dishonest? It's because it is selfish behavior. If everybody acted selfishly and dishonestly all the time, the world would be a very unpleasant place. As Philip Graves says: “There is a balance to strike between the extent to which we can feather our own nest, so to speak, and the risk of being ostracized (排斥) by the group.” So, for societies to work together we need to trust each other and therefore we need to be honest.

    Being trustworthy with money is of course vital for an economy to survive. But being honest with words is another matter, saying what we think to someone can get us into hot water. However, a new anonymous messaging app has been designed that lets anyone with a link to your profile (简介) to send you a message without knowing who it's from. The app now has 300 million users which perhaps indicates how honest we really like to be-but in all honesty, do you want to know what people think about you? Is honesty always the best policy?

    Sharon, Aged 22

    The most important thing to keep in mind when going into high school is to be yourself. Besides, I don't know what your middle school was like, but high school teachers will not care about things such as how much homework you already have in one night. It's best to just learn to deal with things and manage your time wisely so you can achieve everything you need to.

    Frank, Aged 21

    I think almost every kid feels both nervous and excited before their first day. You will probably love it. I know I did. You should join some sports or activities that will make your high school experience more enjoyable. Good luck!

    Eddie, Aged 20

    When I started high school I was really nervous too, especially since I had been homeschooled （自主学习，在家教育）all through middle school and didn't really know anyone. I suppose the best advice would be to just relax. The first couple of days can be a little bit hard, but things will become easier before you know it.

    David, Aged 19

    I'm not going to lie. The first day is kind of frightening(令人恐惧的). But you'll get used to it. Don't be afraid of anyone; upperclassmen（高年级学生） will pick on（招惹） you more if you let them know you're afraid. Just take it easy. Making some friends and staying with them will greatly help you get used to high school quickly. After the first week it's really not bad at all. Don't worry.

    According to a recent study published in Journal of Consumer Research, many people believe that healthy food must be more expensive than unhealthy food. In fact, the study's researchers found that a high price tag will even convince consumers that a certain food is healthful.

    According to Rebecca Reczek, coauthor of the study, the purpose of the study was to examine a popular belief. Sometimes the belief can be true: Organic produce and wild caught seafood typically cost more money. But other times, the nutritional value of food ranks all the same.

    In one experiment, Reczek's team gave a group of participants a new food product called "granola bites". Some participants were told the product was very healthy. Other participants were told the bites had little nutritional value. Participants who were told the granola bites were good for them rated the snack as more expensive than the participants who thought the bites were unhealthy.

    In another experiment, participants were given a health food bar labeled as "the healthiest protein bar on the planet". Some participants were told the bar cost just D|S0.99, others were told the bar was D|S4. And here's what happened: The people who were given the "cheaper" bar needed to read a lot more reviews about the product when it was priced at a lower price point in order to trust that it was healthy.

    The idea that we all believe healthy food needs to be more expensive works against us. All food companies need to do is push up the price to convince us.

But Reczek said, "When we shop, we don't have to be led astray. We can compare nutrition labels and we can do research before we go to the grocery store. We can use facts rather than our intuition (直觉)"．

    Apple and Microsoft each launched new products. One company astonished everyone. The other made people sleepy. Can you guess which was which? You probably guessed wrong. Because Apple, famous for its creative products, was the tech giant whose new product caused a collective shrug. While Microsoft, which stole a move out of the Apple Playbook, won cheers from high-end, creative-class consumers like business analysts, media designers and music producers.

    As Hayley Tsukayama remarked at The Washington Post, the Surface Studio, one of Microsoft's new products, is really just a super-sized version of the Surface Books product that Microsoft has been selling for years. But if you've ever watched science fiction movies like Minority Report-- where Tom Cruise seems to operate pictures and data hanging on mid-air by touching them, spreading his fingers to increase on details, and sending files and information sliding from one folder to another with a click of the finger, you can see how Microsoft is trying to show the same experience.

    Meanwhile, apple's new products were almost like some fine promotions for its Apple TV. They boast that the new Macbook Pro has a smaller size and more functions, and a new touch screen bar on laptop keyboards where function keys used to be.

    So what's going on? In many ways, Apple is focusing on attracting the average consumers who have been attracted by Microsoft. And Microsoft is focusing on targeting the high-end professionals Apple has historically been associated with. You can even see this is the companies' ad campaigns: Microsoft's ads stress imagination and creativity, while Apple's commercial chief performance and convenience of its Macbooks.

    So Apple is trying to control the world of devices and laptops from the top down, starting with the high-end market and moving on to appeal to a broader base of consumers. Microsoft, having already strengthened itself within the bigger low-end market, is now attempting the opposite with a bottom-up strategy. Will they succeed? Time will tell...

On paper, hydrogen (H2) looks like a dream fuel. Coal, oil, and natural gas produce carbon dioxide, which warms the earth when burned, Hydrogen produces pure water. Hydrogen packs more energy into less space than a battery (but certainly less than petrol) . Also, empty tanks (燃料箱) can be refilled with hydrogen much faster than refilling empty batteries with electricity.

While in practice, things are trickier. Storing a meaningful amount of hydrogen gas requires pressing it several hundred-fold. Changing it into the liquid form is another option, but it should be cooled to-253C. Both processes require a heavy and strong tank. While a 700 bar tank is acceptable for a city bus or a truck, adapting it for use in small vehicles is very difficult because the pressure during refilling would be too great.

The solution? Powerpaste.

A German team of researchers, led by Marcus Vogt, have come up with an interesting "powerpaste", which can store hydrogen energy at atmospheric pressure, ready for release when needed. It is so named because it comes in tubes and looks like toothpaste (牙膏) , not in its traditional form of gas.

The main ingredient (原料) of the paste is magnesium hydride, a substance that reacts with water to form hydrogen. The escaped hydrogen can then be directed into a fuel cell, where it reacts with oxygen from the air to produce electric power.

Refueling is very simple, as instead of going to a filling station, drivers and riders can simply replace an empty tube with a new one and refill the water tank.

Given that powerpaste only begins to break down at temperatures of around 250℃ it remains safe even when a vehicle stands in the baking sun for hours.

However, we will have to be patient. Just because researchers have succeeded in developing a new fueling way does not mean that we can expect to see such vehicles on the road anytime soon. It will indeed be several years before this concept is turned into reality.

According to a study published this week, habitual napping (打盹) appears to be associated with a large brain volume in adults although experts stressed that further research was needed. It reduces the cost caused from the lost time and the fatigue-related errors. The work followed previous studies that suggested a brief doze could improve people's ability to learn.

Arianna Huffington, a co-founder of Huff Post and the founder and chief executive of Thrive Global, said, "Given the latest science on the effectiveness of napping and the clear link between employees feeling well rested and their productivity, it's long past time that businesses embrace short naps at work."

Some businesses, including Thrive Global, have already introduced facilities for employees to take naps. Google introduced sleep pods as far back as 2014 and companies like Nike and Ben & Jerry's introduced nap rooms. The practice has even been adopted by the NHS, with a growing number of hospitals introducing sleep pods for staff in an effort to help them get more rest. Employees, it seems, are enthusiastic. Sean Greenwood, of Ben & Jerry's, said, "If a quick nap gets employees more involved and creative, we're happy to provide that for our team members."

Unfortunately, the practice of napping still suffers from our collective concept that sleep equals weakness and laziness. However, the performance-enhancing benefits of naps have been no secret to many leaders throughout history. It also gives the higher-ups the chance to acknowledge the 24/7 culture and come up with top-down solutions that encourage workers to take care of themselves in and out of work.

While sleep experts stressed that a daytime doze could be beneficial, they said it was crucial to get enough shut-eye at the end of a day. It is the late stage of sleep, sometimes missed by early risers, that strengthens the nerve circuits that make for learning and memory, allowing the brain to make and consolidate new neutral connections. Additionally, prioritizing sufficient sleep during the regular nightly sleep period is essential for overall well-being.