But they have never managed to cling to these scientific credentials, or to tone down the religious ones.
"I had a wonderful husband, a wonderful life, but I've never wanted to cling to the past".
Oh, it was terrifying, this journey of life, this turbulent passage through days and nights, never stopping, never knowing what it meant, only that you must cling, cling and never let go!
Undemocratic constitutional changes and legal loopholes should never be used to cling to power," he said.
With tens of thousands of bodies never recovered, many people cling to the hope of finding lost loved ones, often putting up fliers or placing ads in newspapers.
Never knowin' who to cling to when same store sales began to fall.
After his father's death, he looked to religion to help him cope, writing to his cousin Augustus Noble Hand: "If you could imagine one half the comfort my religion has given to me in this terrible loss, you would see that Christ never forsakes those who cling to him".
Mostly, it's because my version of Suri would never admit to clinging to Katie or smiling lovingly at Tom, whom she sees as the two most embarrassing humans on the planet.
It's nice having a rule to cling to, to assure you that you will never look daft, never get hurt, never age, never get fat and never die and plunge into oblivion.
