上海后花园最新论坛

The Chugach people of southern Alaska’s Kenai Peninsula have picked berries for generations. Tart blueberries and sweet, raspberry-like salmonberries — an Alaska favorite — are baked into pies and boiled into jams. But in the summer of 2009, the bushes stayed brown and the berries never came. For three more years, harvests failed. “It hit ... Read more

Meet ploonets: planets of moonish origin. In other star systems, some moons could escape their planets and start orbiting their stars instead, new simulations suggest. Scientists have dubbed such liberated worlds “ploonets,” and say that current telescopes may be able to find the wayward objects. Astronomers think that exomoons — moons orbiting planets that orbit ... Read more

A praying mantis depends on precision targeting when hunting insects. Now, scientists have identified nerve cells that help calculate the depth perception required for these predators’ surgical strikes. In addition to providing clues about insect vision, the principles of these cells’ behavior, described June 28 in Nature Communications, may also lead to advances in robot ... Read more

A new biomaterial delivered to the heart soon after a heart attack can heal damaged tissue from the inside out. Heart attacks kill cardiac muscle tissue, scarring the heart and leaving permanent damage after just six hours. The damage prevents the heart from functioning properly. If there was a way to begin healing damaged tissue ... Read more

As early as 252 million years ago, some plants may have curled up their leaves at night for a cozy “sleep.” Fossilized leaves of two now-extinct Gigantonoclea species bear signs of nyctinasty, or circadian rhythmic folding at night, researchers report February 15 in Current Biology. That would make these specimens the first known fossilized examples ... Read more

A focus on family might be the key to personal well-being. Surveys in the social sciences, such as those measuring happiness or health, tend to focus on the smallest unit: the individual. But two new studies, each surveying over 10,000 people worldwide, show that primary unit of analysis may need scaling up. One study suggests ... Read more

Are your cats play fighting or fighting fur real? It turns out that certain behaviors in domestic cats could be telltale signs that an interaction is friendly, aggressive or something in between, researchers report January 26 in Scientific Reports. “It is a question we hear a lot from cat owners,” says cat behavior expert Mikel ... Read more

The night sky has been brightening faster than researchers realized, thanks to the use of artificial lights at night. A study of more than 50,000 observations of stars by citizen scientists reveals that the night sky grew about 10 percent brighter, on average, every year from 2011 to 2022. In other words, a baby born ... Read more

The Arctic today is a hostile place for most primates. But a series of fossils found since the 1970s suggest that wasn’t always the case. Dozens of fossilized teeth and jaw bones unearthed in northern Canada belonged to two species of early primates — or at least close relatives of primates — that lived in ... Read more