Microbiology: Protozoan protects the gut

Many single-celled microorganisms are harmful, but others regulate the immune responses of their animal hosts to guard against infections.Some such organisms, called protozoa, live in the intestine, but have not been as well studied as their disease-causing counterparts. Miriam Merad at the Icahn School

Climate: Megadroughts loom large

Climate warming looks set to plunge the American Southwest into decades-long drought by the end of the century.Such ‘megadroughts’ have hit the region (Lake Powell on the Colorado River, pictured) during the past millennium. To calculate how changes in temperature, rainfall and soil

Biomaterials: ‘Bones’ made with 3D printer

Synthetic bones promote natural bone regeneration after being implanted into animals.Ramille Shah at Northwestern University in Evanston, Illinois, and her colleagues used a 3D printer to generate ‘hyperelastic bone’. The main component of the material was hydroxyapatite — a calcium mineral similar to one

Astronomy: Magnetism drives star birth

Magnetic fields regulate how stars are born from massive clouds of interstellar gas.A team led by Francesco Fontani at the Arcetri Astrophysical Observatory in Florence, Italy, used high-resolution data from the Atacama Large Millimeter/submillimeter Array telescope in northern Chile to create detailed maps of