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科學界對雲的研究產生有趣的新視野，同時也帶來許多疑問。舉例來說，有些雲可以讓地球降溫；有些雲卻讓地球變熱。但有件事是很確定的：對於雲，如果我們能知道的更多，就能更準確的預測氣候變化。

While research into the nature of clouds continues to yield fascinating new insights, it is also throwing up a number of questions. For example, there are clouds that cool the Earth, and others that cause temperatures to rise. One thing is clear: More information about clouds is needed if we are to make any reliable climate predictions.

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鳶如何選擇路線飛越直布羅陀海？小小的蝴蝶如何飛上海拔3000公尺的高山，飛躍超過2500公里的距離？為了回答這樣的問題，來自一組國際團隊的研究學者在許多動物身上搭載了微小而強效的發射器。

How do kites choose their route over the Straits of Gibraltar? How do tiny butterflies manage to clear mountain altitudes of 3,000 meters and cover distances of more than 2,500 kilometers? In a bid to answer such questions, as many animals as possible are fitted out with small, extremely powerful transmitters by an international team of researchers.

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腎上腺素是一種面向多元的荷爾蒙。在人體承受極大的身心壓力時，腎上腺素立刻將心血管系統和人體的代陳代謝轉換至新的狀態。但腎上腺素也會讓人上癮的，許多從事極限運動的男女運動員，甚至冒著生命危險追求新的刺激。

Adrenaline is a multifaceted hormone. At times of great physical or psychological stress, it swiftly adjusts our cardiovascular system and metabolism to the new situation. But it can also be addictive. In the case of extreme sportsmen and women, some even put their lives on the line in pursuit of new heights of stimulation.

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人類只要被蜱咬一口，就足以感染危險的病原菌。近年來，蜱在歐洲的數量逐漸增加，研究人員希望透過對蜱有更多瞭解，可以增進自身的能力，預測危險爆發的時間和地點。

Just one bite from a tick can be enough to infect a person with dangerous pathogens. Recent years have seen an increase in the number of these parasites in Europe. By finding out more about ticks, researchers hope to improve their ability to predict when and where the dangers are lurking.

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耐力運動已然是一股風潮。但許多醫藥專家對此懷抱著複雜的情緒。一方面感到欣慰，因為人們選擇更積極的生活方式；另一方面，許多業餘的運動員把自己逼得太緊。追求這種強烈的運動需要健康的身體以及長期規律的訓練。否則這樣的壓力會導致肌腱、韌帶和關節受傷，最糟糕的狀態還會因此引起心臟病。

Endurance sport is becoming a mass phenomenon. But medical professionals observe the trend with mixed feelings. On the one hand, they welcome the fact that more people are leading active lifestyles. But on the other, many recreational athletes are pushing themselves too hard. The intensive pursuit of sport requires good health and regular, longterm periods of training. Otherwise, the strain can damage tendons, ligaments and joints and, in the worst case scenario, cause a heart attack.

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科學家觀察到義大利埃特納火山附近的山羊行為，在火山爆發前幾個小時出現改變。讓當地政府有足夠的時間警告附近的居民。而世界上其他地區的動物，牠們的行為是否也能做為危險事件或流行疾病即將發生的準確預兆呢？

Scientists have observed changes in the behavior of goats close to the volcano Mount Etna in Italy several hours before an eruption. This would give the local authorities enough time to warn people living nearby. Can the behavior of other animals in other parts of the world serve as reliable predictor of dangers or even epidemics?

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