A colored transmission electron micrograph of a human serous cell’s nucleus, with its nucleolus in purple. The nucleolus functions as the sort of brain of the nucleus, making rRNA, a basic ingredient for making proteins.
Cnidarians, including corals and many jellyfish, feed and defend themselves with stinging capsules. Some sea slugs have evolved several lines of defense.
Plant growth is increasing because of rising carbon dioxide. But plants return carbon dioxide into the atmosphere at night, in a process called respiration.
The carcasses of 300 reindeer on a plateau in Norway may help engender new plant diversity, according to scientists.
Fin whales differ in size, color and body shape from their cousins, the larger blue whale, but scientists decoding the genome of several baleen species say there was intermingling during the course of their evolution.
Jo-Wilfried Tsonga of France wiped sweat from his face during the Australian Open. Researchers say their new wearable sensor can measure perspiration for conditions like dehydration and fatigue.
The skeleton of Richard III.
Scientists found that the tough exteriors of cockroaches help them keep moving without losing much momentum when they bump into things.
Alia Lesnek, left, and Charlotte Lindqvist of the University at Buffalo, observing boulders on Dall Island in Alaska. Scientists have found evidence in Alaska’s rocks that the first people to populate the Americas were island-hopping sea-farers.
The “Old Blush” rose.
S. Alan Stern, center, New Horizons’ principal investigator, surrounded by children at Johns Hopkins University Applied Physics Laboratory in Laurel, Md., on Tuesday.
Scientists say a recording of disturbing sounds made by American diplomats in Cuba actually may be of a very loud cricket species.
An arctic fox near Helagsfjället mountain in Sweden. Foxes in the area were severely inbred until three males from a Norwegian captive breeding population turned up.
A view of the Milky Way and neighboring galaxies, containing more than a billion stars, released by the European Space Agency’s Gaia mission.
A view of the asteroid Ryugu captured by the Hayabusa2 spacecraft on Sunday, from a distance of about 40 kilometers.
Sister Ofelia Morales Francisco, left, and Sister Rosa Cortez in the Convento Maria Inmaculada de La Salud in Mexico. The nuns make a cough syrup, in the bottle at right, from achoques, a type of salamander vanishing from nearby Lake Patzcuaro.
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