Cicada

An insect with large eyes wide apart on the head and usually transparent, well-veined wings, and with about 2,500 species around the world:



Cicada

Cycloid

The curve traced by a fixed point on a circle, or on the rim of a circular wheel, which rolls smoothly on a straight line:



Cycloid

Cycloid

Claude Debussy

A French composer, one of the most famous and influential of all composers, who created Estampes (Prints) in 1903, and whose picture was on twenty-franc banknote:




Claude Debussy

Claude Debussy

Twenty franc banknote

Paris Opera

The primary opera company of Paris, founded in 1669 by Louis XIV, that is still running:



Paris Opera

Paris Opera

Ballet

Webster's Dictionary defines it as "an artistic dance form based on an elaborate formal technique, characterized by gestures and movements of grace, precision, and fluidity":


Ballet

Sappho

The first woman poet:



Sappho

Sappho, an Ancient Greek poet, is the first woman poet known by name.

Gilgamesh

Western literature begins with this poem composed probably 2000 B.C.:


Gilgamesh (the Babylonian poem Gilgamesh)

Vint Cerf & Robert Kahn

Two persons are known as the fathers of the Internet; they are:


Vint Cerf & Robert Kahn 

Vint Cerf

Robert Kahn 

The Abbey of Saint-Denis

The first Gothic building:



The Abbey of Saint-Denis (in France)

The ambulatory at the Abbey of Saint-Denis.

France

Gothic architecture began in:


France

Jericho

The earliest surviving evidence of a town, located on the Jordan River, where the settlement began around 7500 B.C.:



Jericho

Dwelling foundations unearthed at Tell es-Sultan in Jericho

Megalith

A large stone that has been used to construct a structure or monument, either alone or together with other stones:



Megalith

Stonehenge, Wiltshire, United Kingdom, is one of the world's best known megalithic structures.

Neolithic

The last part of the Stone Age, a period in the development of human technology beginning about 10000 years ago, ending when metal tools became widespread in the Bronze Age:



Neolithic

Lower Paleolithic

The prehistoric period of human history which spans the time from around 2.5 million years ago when the first evidence of craft and use of stone tools by hominids appears in the current archaeological record, until around 300,000 years ago:


Lower Paleolithic


The Paleolithic Age, a prehistoric period of human history distinguished by the development of the most primitive stone tools discovered, contains three subdivisions:

Lower Paleolithic [2.5 million to 300,000 years ago]
Middle Paleolithic [300,000 to 30,000 years ago]
Upper Paleolithic (or Late Stone Age) [40,000 and 10,000 years ago]

Terra Amata

The earliest known structures built by humans are at:




Terra Amata

Terra Amata is an archeological site in southern France.

Sexagesimal

A numeral system with sixty as its base:



Sexagesimal (or Sexigesimal)

Sexagesimal originated with the ancient Sumerians in the 3rd millennium BC, it was passed down to the ancient Babylonians, and it is still used — in a modified form — for measuring time, angles, and geographic coordinates (see Sexagesimal for more info).

Mars

The terrestrial planets are the four closest to the sun: Mercury, Venus, Earth, and:




Mars

Terrestrial Planet

A planet that is composed primarily of silicate rocks or metals:



Terrestrial Planet