It's bad enough that restaurant workers who receive tips are usually paid below the minimum wage, at $2.13 an hour. But you know what's worse? The fact that moms who work in those jobs are often forced to choose between working sick and not having a paycheck. Those moms are also penalized when their shift is changed at the last minute and they have to scramble to adapt their child care arrangements on the fly. Here are some more facts that will make you think.