xanthine (group of alkaloids, including caffeine)

Yekaterinburg (a city, the administrative center of Sverdlovsk Oblast, Russia)

being volatile (evaporating or vaporizing readily under normal conditions), volatility

academic (scholarly; literary or classical, in distinction from scientific)

beg / invite / ask

surreal, surrealist, surrealistic

unrealistic

(geometry) Euclidean distance - the distance between two points defined as the square root of the sum of the squares of the differences between the corresponding coordinates of the points; for example, in two-dimensional Euclidean geometry, the Euclidean distance between two points a = (aₓ, a_y) and b = (bₓ, b_y) is defined as:

international

sexual orientation