You ought to stand back from the edge of the platform.

Her driver's licence requires her to wear corrective lenses while driving.

The so-called spinor algebra of C(2), the language of the quantum mechanics, is formulated in terms of the idempotents and nilpotents of the geometric algebra of space, including its beautiful representation on the Riemann sphere, and a new proof of the Heisenberg uncertainty principle.

[H]e found she had not taken the veil; but her mother being lately dead, had entered as a pensionaire, until her family-affairs could be adjusted.