【推荐1】Americans spend nearly 40 minutes a day cleaning their homes. Fortunately, you can re-gain those precious minutes with these genius cleaning tips that only the professionals know     1    !

Freshen up your garbage disposals (处理器)with some lemons.

With all the junk we throw into our garbage disposals, it's no wonder that they're real petri dishes (培养皿)with the awful smell to prove it. Thankfully, making them a whole lot cleaner is easy： Simply drop some cut lemons down your drain.    2    .

Make the bathtub clean with grapefruit and salt.

    3    . So the next time you’re at the supermarket, make sure to throw an extra grapefruit into your cart—not for eating, but for cleaning. Just cut the fruit open and cover it in salt. The salt creates a special texture while the acid in the grapefruit will help break down stains.

    4    

Research published in 2015 in Scientific Reports suggests that our coffee makers are an absolute hotbed of bacterial activity, which means that we might just be taking in some of that disgusting stuff along with our dark roast.     5    ? A monthly vinegar wash should do it. Simply fill your coffee maker's reservoir with a few tablespoons of white vinegar mixed with water, run it once more with only water to remove any remaining vinegar smell.

【推荐3】Nowadays, all universities are doing whatever they can to become a green campus. But there are also items students can do to make your campus eco-friendlier.

Recycle everything, especially paper!

There is a large amount of paper a college student goes through per semester.     1     We know that these things can’t be avoided, but the way you handle the use of all the paper can really help create a better green campus.

Buy green.

    2     Paper, cleaning products and water are products that can be bought as recycled goods. They’re slightly more expensive than the normal products, but it’s worth it to make a green campus.

Walk and bike to school.

Most campuses, especially those that are trying to become an eco-friendlier campus, have pretty good public transit.     3     Walking or biking will help make your campus a green university.

    4    

A water bottle can be refilled at any water fountain and can easily be drunk in class or while riding a bike. This will save the environment by decreasing the amount of plastic waste on your campus.

Buy used clothing.

It is usually thought of as something to do to save money.     5     Recycling clothes minimize the use of resources to make clothing.

【推荐1】Does stress cause gray hairs? Many people believe that stress can cause your hair to lose its color. In fact, it is an old wife’s tale that being upset all the time can result in hair graying early. Here is a closer look at this situation and why some believe that this old wife’s tale could be true.

As one ages, the hairs on the head also age. In fact, just about everything on the human body begins to show signs of wear after a while. Hairs on the head grow and finally die. They are replaced, but in the process something else happens when old hairs are replaced by new hairs. The color of pigment is also added to them. However, as one ages, this pigment becomes less and less available. At first, hairs will have a limited amount of pigment and they will appear to be gray in color. In time, they will lose all of their pigment and will be white.

Many things are known to cause graying, and genetics is a very powerful factor. If one of your parents turns gray at an early age, there is a good chance that you will too. Some people begin the graying process in high school, while others may be over the age of forty.

If you are whites, you will probably notice graying in your mid-thirties. Blacks may be well into their forties. This is not always true, but it is common practice.

Constant worry and stress can have many bad effects on the human body. It is a known fact that stressful times can cause one to suffer hair loss. It would make sense that if stress can cause these problems, perhaps it also may lead to graying. However, there is no sound evidence to support this. On the other hand, many doctors believe that there may be a link between graying and constant state of anxiety or stress.

【推荐2】Have you ever wondered about the significance of emotions in our life? Emotions play a critical part in our lives.     1     Let me give you an example here: When you are with your loved ones, your mood changes instantly right? If they feel happy then you feel happy, and if they feel angry/sad then so do you. Starting to get what I was talking about in the beginning? Should you be feeling like that? In certain situations, yes, but every time, no!

You may find it very hard to believe but it is not our responsibility to bear other people’s feelings, this is something that they have to do themselves.     2     Apart from this, we must never be controlled by our own feelings. Let me give you an example here. In the middle of a fight between your spouse or partner, they will say, “You really hurt my feelings”. Sometimes, you might even say: “You are making me angry”. What does this imply?     3     Whenever this happens, you start blaming yourself, especially for the emotions that others are feeling. This is known as emotional reflection. You must learn to control this.     4    

What should be your course of action here? It might seem rude when I say this but you really need to hear it. You are not responsible for how others feel!     5     Al l in all, we must learn to be emotionally accountable and mature, doing so will result in a better and happier life.

【推荐1】When life gives you pineapples—and hundreds of millions of tons of pineapple waste—what do you do? Engineers in Singapore and Vietnam decided to turn all the waste into something useful—the heat barrier for their pineapple juice. Not only does their new material keep drinks cool better than many commercial coolers, but it could also offer a final resting place for the world’s pineapple waste.

To find a use for those leftovers, the researchers mixed pineapple fibers, which they cut up in an electric device, with a sticky agent as a solvent. They then treated the mix with sound waves at frequencies greater than 20 kHz and heated it in an oven at 80℃for 2 hours. The suspension that formed was then cooled before being freeze-dried.

The result was a pale yellow aerogel (气凝胶) that is lightweight, flexible, and more than 96% porous (多孔的)—qualities that make it an ideal material against both heat and sound.

When the researchers wrapped a sheet of the pineapple aerogel around a military-style canteen bottle, they found that the aerogel could provide three times the heat exchange reduction of commercially available alternatives—they reported this month inMaterials Chemistry and Physics. The gel-wrapped bottle kept -3℃water cooled below 0℃for 6 hours and liquid heated to 90℃above 40℃for 2.5 hours. What’s more, the pineapple gel also acted as a sound barrier; in another test, the gel did a better job of preventing noise from getting in or out than Basmel, a popular kind of sound barrier.

The findings provide a new, eco-friendly approach to recycling agricultural cast-offs—and a good excuse to get a better electric device for your kitchen.