May 22, 2026 · Thermodynamics, science of the relationship between heat, work, temperature, and energy. Thermodynamics deals with the transfer of energy from one place to another and from one …

May 16, 2026 · Greta Thunberg is a Swedish environmental activist who worked to address the problem of climate change, founding (2018) a movement known as Fridays for Future (also called School …

May 29, 2026 · Moscow, city, capital of Russia since the late 13th century. It is not only the political center of Russia but also the country’s most populous city and its industrial, cultural, scientific, and …

Apr 17, 2026 · Spartacus, leader in the Gladiatorial War (73–71 BCE) against Rome. Although his uprising was not an attempt at social revolution, his name has frequently been invoked by …

May 19, 2026 · Black bear, the most common bear (family Ursidae), found in the forests of North America, including parts of Mexico.

May 4, 2026 · Cybercrime, the use of a computer as an instrument to further illegal ends, such as committing fraud, stealing identities, or violating privacy. Cybercrime, especially through the Internet, …

2 days ago · Moldova, country lying in the northeastern corner of the Balkan region of Europe. This region was an integral part of the Romanian principality of Moldavia until 1812, when it was ceded to …

May 2, 2026 · Separation of powers, division of the legislative, executive, and judicial functions of government among separate and independent bodies. Such a separation limits arbitrary excesses by …

3 days ago · Malaysia is a country of Southeast Asia, lying just north of the Equator, that is composed of two noncontiguous regions: Peninsular Malaysia, which is on the Malay Peninsula, and East …

May 15, 2026 · Capital punishment is the execution of an offender who is sentenced to death after being convicted of a criminal offense by a court of law. The term ‘death penalty’ is sometimes used …