1. Running cold water over onions while cutting, can prevent you from crying.
The logic of running water is just to prevent the reaction that will stimulate lacrimal gland (the gland that produces tears). That way tears will be avoided. So in short, running water prevent the chemical in the onion causing crying not to be effective.
2. When a woman is pregnant, her senses are all heightened.
This is very true. Especially the smelling part. She’s more conscious and alert due to this physiological state. Most pregnant woman will feel pain easily, at the smallest pressure you apply they respond. Be a good man by taking care of your pregnant wife. Gestational period is another physiological state for women, so they need more care.