Handedness is a tendency to prefer the use of one hand over the year, and we are accordingly labelled right-handed or left-handed. Today is International Left-handers’ Day, observed to appreciate left-handedness in a world numerically dominated by righties.
Humans are predominantly right-handed but our planet itself is a lefty, rotating from west to east. So is the solar system. According to a 2011 study, there are more spiral galaxies rotating counter-clockwise, a.k.a. left-handed spiral galaxies, than their right-handed counterparts.
There is left-handedness within ourselves as well. Amino acids, the basic building blocks of life, are left-handed. The heart in the human body is on the left side.
