The first two are actually sayings...
"Sweating like a pig"--Pigs don't have sweat glands.
"Eating like a bird"--Birds eat up to 10 times their weight in food.
Now the "Cell phones cause cancer" is still incomplete. It's one of those "We can't prove that they do, but we can't prove that they don't" things.
E=mc2: Shown to be wrong a long time ago.
The marriage rate is 8.4 per 1000 population. The divorce rate is 4.2 per 1000. (SOURCE:
National Center for Health Statistics) But you can't necessarily correlate that into "Half of all marriages end in divorce."
"All men are created equal"--Depends on how you interpret this statement