“I’m just hanging by a thread,” said Mr. Brown. “Is it as bad as that?” asked Mr. Hunter. “Oh, I’m all right,” said Mr. Brown, “only for this numbness in my legs, and I’ve got cataracts and can’t half ...

If we run a thread through the holes of ten needles, that piece of thread will be the common thread – the common thread that links up the ten needles. In other words, the ten needles all share the ...