(Encyclopedia) proton, elementary particle having a single positive electrical charge and constituting the nucleus of the ordinary hydrogen atom. The positive charge of the nucleus of any atom is due…
(Encyclopedia) radonradonrāˈdŏn [key], gaseous radioactive chemical element; symbol Rn; at. no. 86; mass no. of most stable isotope 222; m.p. about −71℃; b.p. −61.8℃; density 9.73 grams per liter at…
(Encyclopedia) Sitwell, English literary family, one of the most celebrated literary families of the 20th cent. Its members included Dame Edith Sitwell, 1887–1964, English poet and critic, Sir Osbert…
photos by Carol M. Highsmith Prev Next Havana, Cuba The capital and Cuba's largest city, Havana boasts more than 2.5 million inhabitants. Havana is also one of the America's oldest cities,…
(Encyclopedia) Great Basin, semiarid, N section of the Basin and Range province, the intermontane plateau region of W United States and N Mexico. Lying mostly in Nevada and extending into California…
New First Pets Spot, Ernie, and India go to Washington by Holly Hartman Socks on the podium in the White House briefing room. The former First Cat belongs to Chelsea Clinton—Bill…
