The worst jobs are

Brazilian mosquito researcher.
Scientists fighting malaria must study the biting habits of the mosquito that spreads it. In Brazil, that's the Anopheles Darlingi, which doesn't fall for the light or wind traps researchers use in Africa: this smart little sucker will come near scientists only when they offer themselves as bait. In the early evening, when mosquito activity is busiest, a mosquito dinner- researcher finds a nice buggy area and sets himself up inside a mosquito-netting tent with a gap at the bottom. Mosquitoes fly in low and get trapped inside, where the researcher sits stoically, sacrificing his skin to science. He needs focus only on his legs to keep him busy: whenever a mosquito chooses a drumstick dinner, the researcher draws it into a mouth tube and then expels it into a container. Veteran researcher Helge Zieler used to put himself on the menu twice a week. On his best evening, he caught 500 Anopheles in 3 hours. Meanwhile, of course, the skeeters feasted on his entire corpus-a grand total of about 3,000 bites, or an average of 17 per minute for 180 minutes on end. "It's not so bad," he says, explaining that his personal response to mosquito bites is an immediate itch that goes away naturally in a few minutes. Except when his response is to contract malaria. Despite taking prophylactic chloroquine, Zieler developed a case that took him two years to shake.

Portable toilet cleaner.
This job is a sort of combination of garbage collector and gastroenterologist, and arguably more disgusting than both put together. Although most people in polite society methodically avoid situations where they need to use a portable toilet, modern outhouses can be lifesavers. As gross as they can be, they'd be worse without the folks who clean them for a living. Using a tank and a vacuum wand, cleaners must suck up all the waste in a portable toilet. After picking up any stray toilet paper, they also wash down all surfaces that could possibly be soiled, including the walls. This is when a high-pressure hose comes in handy. Usually, cleaning one portable toilet takes only a few minutes, and most workers clean from 10 to 60 of them a day. But it's not always that easy: Portable toilets that tip over require more damage control. Nevertheless, some cleaners grin and bear it - and take home $50,000 a year.