2 . Humans evolved (进化) from apes. This is what we learned in biology class. But what came before apes? Chinese scientists have discovered fossils that could enrich the evolutionary story of how humans evolved from fish.

According to four articles published in the journal Nature in late September, Chinese researchers found fish fossils that provide the “missing link” about the origin of the jaw (下颌)，a key trait (特征) that 99.8 percent of vertebrate species (脊椎动物) have.

Zhu Min, a lead researcher of the studies from the Chinese Academy of Sciences, told China Daily that the findings drew a large amount of interest in the science world due to the importance of jaws in animal evolution. However, the rise of the jaw had been a mystery due to a lack of sufficient fossil evidence to support that jawed vertebrates lived 450 million years ago.

The latest findings made by Zhu’s team presented a set of five surprisingly well-preserved fish fossils that included three whole-bodied fish, helping scientists paint a more accurate evolutionary picture of the origin of the jaw. The fish fossils were discovered at two sites in Chongqing and Guizhou, whose strata (地层) date back to the Silurian Period (志留纪) that began around 440 million years ago.

These fossils show that jawed fish were already thriving in the world’s ancient oceans at that time. Later on, more diverse and larger jawed fish evolved and began to spread around the world, paving the way for some fish to eventually go on land and evolve into other animals — including humans.

“These fossils provide an opportunity to peek into the ‘dawn of fish’ and help scientists track many human body structures back to these ancient fish, thus filling some key gaps in the evolutionary history of how fish evolved into humans.” Zhu said.

3 . George Prochnik would like the world to put a sock in it. He makes his case in a new book, listenning for Meaning in a World of Noise, here he explains himself (using his indoor voice):

“We’ve become so accustomed to noise, there’s about almost a deep prejudice against the idea that silence might be beneficial. If you tell someone to be quiet, you sound like an old man. But it’s never been more important to find continuing quiet. Silence focuses us, improves our health, and is a key to lasting peace and satisfaction.”

“We need to excite people about the sounds you start to hear if you merely quiet things down a little. During a Japanese tea ceremony, the smallest sounds becomes a kind of art—the spoons making a light ringing sound on a bowl, the edges of a kimono(和服)brushing against the floor.”

“Dear people are very attentive(专注的)in almost every aspect of life. If two deaf people are walking together, using sign language, they constantly watch out for each other and protect each other by paying steady attention to the other. They are connected yet also fully aware of their surroundings. Even deaf teenagers! We in the hearing world can learn from them. If we remove the powerful blasts(一阵阵)of noise, we become aware of an extraordinarily rich world around us—of little soft sounds and the sound of footsteps, of bird songs and ice cracking(开裂声). It’s astonishing how beautiful things sound when you can really listen. ”

4 . According to a recent study in the Journal of Consumer Research, both the size and consumption habits of our eating companions can influence our food intake. And contrary to existing research that says you should avoid eating with heavier people who order large portions (份), it’s the beanpoles with big appetites you really need to avoid.

To test the effect of social influence on eating habits, the researchers conducted two experiments. In the first, 95 undergraduate women were individually invited into a lab to ostensibly (表面上) participate in a study about movie viewership. Before the film began, each woman was asked to help herself to a snack. An actor hired by the researchers grabbed her food first. In her natural state, the actor weighed 105 pounds. But in half the cases she wore a specially designed fat suit which increased her weight to 180 pounds.

Both the fat and thin versions of the actor took a large amount of food. The participants followed suit, taking more food than they normally would have. However, they took significantly more when the actor was thin.

For the second test, in one case the thin actor took two pieces of candy from the snack bowls. In the other case, she took 30 pieces. The results were similar to the first test: the participants followed suit but took significantly more candy when the thin actor took 30 pieces.

The tests show that the social environment is extremely influential when we’re making decisions. If this fellow participant is going to eat more, so will I. Call it the “I’ll have what she’s having” effect. However, we’ll adjust the influence. If an overweight person is having a large portion, I’ll hold back a bit because I see the results of his eating habits. But if a thin person eats a lot, I’ll follow suit. If he can eat much and keep slim, why can’t I?

5 . Bangladesh’s floating gardens, built to grow food during flood seasons, could offer a continuous solution for parts of the world which are likely to suffer from flooding because of climate change, a new study has found.

Bangladesh’s floating gardens began hundreds of years ago. The gardens are made from native plants that float in the rivers and operate almost like rafts (筏), rising and filling with the waters. Historically, they were used to continue growing food during rainy seasons when rivers were filled with water.

The farmers layer the plants about three feet deep, creating a version of raised-bed gardens that float in the water. Then, they plant vegetables inside those rafts. As the raft-plants rot away, they release nutrients, which help feed the vegetable plants.

But as climate change affected the volume of water in those rivers, the researchers wanted to understand whether Bangladesh’s floating gardens could be a continuous farming practice. They interviewed farming families and found strong evidence that floating gardens provide stability, both in the amount of food available to feed rural populations and in a farming family’s income.

They found that farmers typically use hybrid (杂交) seeds, which must be repurchased each year, to grow a diverse range of vegetables in the floating gardens. The gardens are also sensitive to pests, so farmers end up spending some money on both pesticides and fertilizers. But even with those expenses, they found, benefits outweighed costs. One farmer told the research team that he earns up to four times as much money from the gardens as from traditional rice fields.

However, before gaining profits, farmers often take out high-interest loans (贷款) to cover the investment costs of filling the beds and stocking them with plants. Luckily; there are also lower-interest loans from responsible government or non-governmental organizations, which could ease that burden.