Obesity now affects more than 600 million people worldwide and is increasingly becoming a serious public health problem. But despite this, we still don't completely understand what causes people to become obese. Scientists know it's an interaction between our genes and our environment, including the unique environment of microbes that live in our guts, but they are still unsure of how exactly these factors come together to cause someone to become overweight and eventually obese.
The Three Gorges Dam stands 185m high and 3,035m wide. Hydropower projects have had huge impacts on the Yangtze. The dam was designed to beneﬁt people by controlling ﬂoods, generating power and aiding navigation, but it has upset the natural ﬂow of the river. WWF and others are working with the operators of the Three Gorges Dam to ensure enough water is being released at key moments, thereby restoring the natural pulse of the river and supporting the needs of wildlife downstream.
For certain species of spider, sex culminates with the male getting eaten. But not all spiders go meekly into the jaws of their partners. Some males tie their mates up to avoid becoming a meal. Others copulate with females before they have grown into mature sexual cannibals, scientists reported September 20 in the journal Biology Letters.
The courtship song of the midshipman fish is a pleasure that can only be enjoyed by night. It turns out that these long, droning hums follow a daily rhythm that is set by light and the hormone melatonin. With enough light, singing fish can be made to quiet down, a condition that is remedied with a boost of melatonin, scientists reported today in the journal Current Biology.
Today, the Paris Agreement got a big boost. 31 countries ratified or accepted the Paris Agreement, an internationa climate change treaty, an international climate change treaty that calls upon nations to reduce their total greenhouse gas emissions. The goal is to try and stave off the worst effects of global warming, such as extreme temperatures and sea level rise.