Some molecules have isomers, left-handed and right-handed versions of the same atoms.

Almost all of these particles come in "left-handed" and "right-handed" versions (see chirality).

Some models are available in left-handed versions.

This, and the Professional, with a rotating handle to reduce hand fatigue (about £42), are available in left-handed versions.

A bridge with piezoelectric pickups is available on all models except left-handed and six-string versions.

Colorado Boomerangs sells a variety of boomerang styles, and the company says that every model is available in a left-handed version.

Many objects are sold in left-handed versions, which are often more expensive than the right-handed versions.

Serving spoons have wide bowls and gently curving handles, and all are available in left-handed versions.

Most biochemists think it is just an accident that "life as we know it" selected the left-handed version.

But for some unknown reason, only the left-handed versions of amino acids are created and used by most live organisms.