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Tamoxifen, sold under the brand name Nolvadex among others, is a selective estrogen receptor modulator used to prevent breast cancer in women and men. [13] It is also being studied for other types of cancer. [13] It has been used for Albright syndrome. [14] Tamoxifen is typically taken daily by mouth for five years for breast cancer. [14]
Earth is the third planet from the Sun and the only astronomical object known to harbor life. It is the densest planet in the Solar System and the largest and most massive of its four rocky planets. About 29 percent of Earth's surface is land, with the remaining 71 percent covered with water and much of Earth's polar regions covered in ice.
ARKive was a global initiative with the mission of "promoting the conservation of the world's threatened species, through the power of wildlife imagery", [1] [2] which it did by locating and gathering films, photographs and audio recordings of the world's species into a centralised digital archive. [1]
On Christmas Eve 1968, American astronaut Bill Anders quickly snapped a photo of the Earth as he and his Apollo 8 crew members became the first human beings to orbit the moon.
[1] Pictures nominated by the public were reviewed by editors who then compiled 100 photographs that they felt portrayed technological photographic achievements, documented historic events and accomplishments or have achieved iconic cultural and, symbolic status. [1]
Life on Our Planet is an American television nature documentary series released on Netflix and produced by Amblin Television and Silverback Films. Executive-produced by Steven Spielberg and narrated by Morgan Freeman, the series focuses on the evolutionary history of complex life on Earth. Upon its release, the series received generally mixed ...
The history of life on Earth traces the processes by which living and extinct organisms evolved, from the earliest emergence of life to the present day. Earth formed about 4.5 billion years ago (abbreviated as Ga, for gigaannum) and evidence suggests that life emerged prior to 3.7 Ga. [1] [2] [3] The similarities among all known present-day species indicate that they have diverged through the ...
The Earth will be hit by a tiny asteroid today, astronomers have said. But the tiny asteroid – which is roughly one metre in size – will burn up in the atmosphere as it arrives. That means it ...