Chang'e 4 (; Chinese: 嫦娥四号; pinyin: Cháng'é Sìhào; literally: 'Chang'e No. 4') is a Chinese lunar exploration mission that achieved the first soft landing on the far side of the Moon, on 3 January 2019. A communication relay satellite, Queqiao, was first launched to a halo orbit near the Earth-Moon L2 point in May 2018. The robotic lander and Yutu 2 (Chinese: 玉兔二号; literally :"Jade Rabbit No. 2") rover were launched on 7 December 2018 and entered orbit around the Moon on 12 December 2018. The mission is the follow-up to Chang'e 3, the first Chinese landing on the Moon. The spacecraft was originally...

The golden poison frog (Phyllobates terribilis), also known as the golden frog, golden poison arrow frog, or golden dart frog, is a poison dart frog endemic to the Pacific coast of Colombia. The optimal habitat of P. terribilis is the rainforest with high rain rates (5 m or more per year), altitudes between 100 and 200 m, temperatures of at least 26 °C, and relative humidity of 80–90%. In the wild, P. terribilis is a social animal, living in groups of up to six individuals; however, captive P. terribilis specimens can live in much larger groups. These frogs are often considered innocuous due to...

Hydrogen peroxide is a chemical compound with the formula H2O2. In its pure form, it is a pale blue, clear liquid, slightly more viscous than water. Hydrogen peroxide is the simplest peroxide (a compound with an oxygen–oxygen single bond). It is used as an oxidizer, bleaching agent and antiseptic. Concentrated hydrogen peroxide, or "high-test peroxide", is a reactive oxygen species and has been used as a propellant in rocketry. Its chemistry is dominated by the nature of its unstable peroxide bond. Hydrogen peroxide is unstable and slowly decomposes in the presence of light. Because of its ...