Number 0.5 (or ½)

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[Language]  Prefixes: Half, Hemi-, Semi-, Demi-…

[Math.]  The Riemann’s hypothesis (or Artin’s conjecture) states that all nontrivial zeroes of the Riemann zeta functions lie on the “critical line” x = 0.5. It was only proved that all nontrivial zeros are symmetrically placed about that line; and at least 40% of such zeroes must lie on that line (Vardi, 1991).

[Math.]  The value of some basic mathematical functions: sin(30o) = sin(150o) = cos(60o) = cos(300o).

[Math.]  The ½-th power of a number is called its square root.

[Math.]  The radius of a circle is equal ½ of its diameter.

[Math.]  Round-up rule: If the decimal part of a number is .5 or higher, round it up to the next whole number, if it is less than .5, round it down to the whole number.

However, banker’s Rounding rule is to round the number with decimal .5 to the nearest even number (not always round it up).

[Measure]  One half of a unit or 50%. Half-half (or 50-50) is a popular way of fair shares between two parties.

[Measure]  Half-half milk has averagely 24 g total fat (included 16 g saturated fat) in a cup. Whole milk has averagely 8 g total fat (included 5 g saturated fat) in a cup (236.588 ml).

[Medical]  In doctor’s prescription, “ss” means “a half”, from Latin word “semis”.

[Movie]  Names of TV shows/series or movies: “Half Moon Junction”, “Return to Half Moon Junction”, “Half Past Dead” and “Half Nelson”.

[Science]  Half-life is the time interval required for a population size to reduce or disintegrate by a factor of two.

[Sports]  Halved hole: in a game of golf in the format of “match play”, a hole is halved if each sides holes out the same number of strokes.

[Sports]  In a football game, when a penalty would move the football pass the goal line, into the end zone, then it moves the football only half the distance to the goal line.

[Tech.]  The width (inches) of standard staples (used in staplers).

[Tech.]  The minimum size (diameter, in mm, millimeters) of lead for mechanical pencils. Other popular sizes: 0.7, 0.9 and 1.1 mm.