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Salt water centric diatom frustule (skeleton). Diatoms are microscopic, unicellular algae that produce intricate silica (glass) cell walls that overlap like the top and bottom of a box. When diatoms die, their soft, internal parts deteriorate, leaving their hard, porous, glass skeletons behind. Diatoms are found in aquatic environments, and saltwater diatom skeletons appear in the fossil record as early as the Jurassic period (180 million years ago). In the United States, numerous deposits…

Head of a mosquito under a microscope.

Centric fossil freshwater Diatom frustule, Klamath Falls Oregon, USA. SEM X600

被写体がまったくわからない、不思議な顕微鏡写真:ギャラリー(WIRED.jp)

ピンもと:BBC Nature

Space creatures

In 2007, a little known creature called a tardigrade became the first animal to survive exposure to space. It prevailed over sub-zero temperatures, unrelenting solar winds and an oxygen-deprived space vacuum. On Monday, this microscopic cosmonaut has once again hitched a ride into space on the Nasa shuttle Endeavour. Its mission: to help scientists understand more about how this so-called "hardiest animal on Earth" can survive for short periods off it.

BALL TIPPED SEA ANEMONE

Diatoms are a major group of algae, and are among the most common types of phytoplankton.

The human egg. Microscopic