Science

Diverticular diseases involve colon-wall pouches (diverticula). Diverticulosis is often silent; diverticular disease includes symptoms, bleeding, or diverticulitis.

Human organ systems are groups of organs that work together—such as the cardiovascular, respiratory, digestive, nervous, and endocrine systems—to keep the body functioning.

No. Dolphins are mammals, not fish, even though they live their whole lives in the ocean. Like other mammals, they are warm-blooded, breathe air with lungs (through a blowhole), give birth to live young, and nurse them with milk. Fish typically breathe with gills and usually have scales; dolphins do not. Whales and porpoises are … Read more

Yes. On September 23, 2026, Roll Call reported that the White House is scrapping plans for an executive order that would have given the Trump administration greater control over National Institutes of Health grantmaking, including Office of Management and Budget discretion over awards. The proposal had drawn bipartisan pushback from Senate appropriators, including Appropriations Chair … Read more

Dogs have blood types based on inherited antigens on red blood cells, classified mainly as dog erythrocyte antigens (DEA). Recognized DEA groups include DEA 1, 3, 4, 5, 6, 7, and 8; other systems such as Dal and Kai 1/2 are also used. DEA 1 is the most clinically important type for transfusions and is … Read more

Disaccharides are double sugars—two monosaccharides joined by a glycosidic bond—such as sucrose, lactose, and maltose.

The dielectric constant, or relative permittivity, is the ratio of a material-filled capacitor’s capacitance to that of the same capacitor in a vacuum.

Yes. On September 23, 2026, Italy’s Senate gave final approval to enabling legislation paving the way for a return to nuclear power, clearing the upper house 81–51 with seven abstentions, according to reporting by The Independent. The bill, which had already passed the Chamber of Deputies, does not authorize construction of reactors. It authorizes the … Read more

Decompression stops are staged pauses on ascent that let dissolved inert gas leave a diver’s tissues, reducing the risk of decompression sickness.

A cyclotron is a particle accelerator that uses a constant magnetic field and alternating electric fields to speed charged particles along a spiral path; still used for medical isotopes and research.