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National Road

(Encyclopedia)National Road, U.S. highway built in the early 19th cent. At the time of its construction, the National Road was the most ambitious road-building project ever undertaken in the United States. It final...

Lorentz, Hendrik Antoon

(Encyclopedia)Lorentz, Hendrik Antoon hĕnˈdrək änˈtōn lōˈrĕnts [key], 1853–1928, Dutch physicist, a pioneer in formulating the relations between electricity, magnetism, and light. He was one of the first...

Lively, Dame Penelope

(Encyclopedia)Lively, Dame Penelope, 1933–, English novelist, b. Cairo, Egypt, moved to London at 12 when her parents divorced, grad. Oxford (1954). Her earliest books were children's novels—the first Astercote...

Bithynia

(Encyclopedia)Bithynia bĭthĭnˈēə [key], ancient country of NW Asia Minor, in present-day Turkey. The original inhabitants were Thracians who established themselves as independent and were given some autonomy a...

Zuckerberg, Mark Elliot

(Encyclopedia)Zuckerberg, Mark Elliot, 1984–, American computer programmer and business executive, b. Dobbs Ferry, N.Y. A computer prodigy as a child, he entered Harvard in 2002 and two years later co-founded The...

Eddy, Mary Baker

(Encyclopedia)Eddy, Mary Baker, 1821–1910, founder of the Christian Science movement, b. Bow, N.H. As physical frailty prevented her regular school attendance, she spent the early part of her education learning a...

Chopin, Frédéric François

(Encyclopedia)Chopin, Frédéric François frādārēkˈ fräNswäˈ shôpăNˈ [key], 1810–49, composer for the piano, b. near Warsaw, of French and Polish parentage. His lyrical, often melancholy, compositions ...

conservation laws

(Encyclopedia)conservation laws, in physics, basic laws that together determine which processes can or cannot occur in nature; each law maintains that the total value of the quantity governed by that law, e.g., mas...

eclipse

(Encyclopedia)CE5 A. Lunar eclipse B. Solar eclipse eclipse ēklĭpsˈ, ĭ– [key] [Gr.,=failing], in astronomy, partial or total obscuring of one celestial body by the shadow of another. Best known are the lu...

dating

(Encyclopedia)dating, the determination of the age of an object, of a natural phenomenon, or of a series of events. There are two basic types of dating methods, relative and absolute. In relative dating, the tempor...