Saul Bellow wrote his last novel, “Ravelstein,” at age 84, and the book is a masterpiece, marred only by the fact that Bellow, in his elderliness, did keep on repeating himself[…].

The most general Jordan curves, like the triangle, have the property of dividing the plane into two regions.

Next time at Kew, look in the rock garden at the hedgehog plant, Erinacea anthyllis, with its mauve flowers.

Look not so near, with hope to understand, Out-cept, sir, you can read with the left hand.