Content by The Scientist

In this Arabidopsis thaliana root tip, calcium ion concentrations in the mitochondria vary from low (blue) to medium (green) to high (red).

The blue dragon nudibranch (Glaucus atlanticus) can feed on venomous Portuguese man o’ wars (Physalia physalis) and arm itself with their cnidarian sting.

Two parent yeast cells (Schizosaccharomyces pombe), fused during sexual reproduction, release their four offspring (orange).

South America’s Atacama Desert, one of the driest places on Earth, was blanketed in colorful flowers twice this year after record-breaking rainfall.

The eastern Santa Cruz tortoise (Chelonoidis donfaustoi) was classified as a new species of Galápagos tortoise last month after genetic analyses separated it from the western Santa Cruz tortoise (C. porteri).

Engineered T cells (purple) release nanoparticles (yellow) to recruit neighboring T cells in this assault on melanoma tumor cells (green).

November 2015's selection of notable quotes

Researchers are striving to understand exactly what has made the global population get so fat so fast.

How the foods that make us fattest are not that different from heroin and cocaine

Columbia University researcher Rudy Leibel discusses a study that found benefit in a high-fat diet.

A colony of Argentine ants (Linepithema humile) investigating an empty arena left pheromone trails in these estimated patterns.

The i’iwi, or scarlet Hawaiian honeycreeper (Drepanis coccinea), is one of many rare birds threatened by climate change in Hawaii’s higher elevation forests.

The smallest known free-living insect, Scydosella musawasensis, is only 0.325 mm long.

This slice of human colon tissue shows goblet cells (red) surrounded by enterocytes and connective tissue.

Actin bundles (gold) in these human myoblasts provide mechanical support for the cells’ movement and function.