Unless you're independently wealthy or dedicated to poverty you probably need a job. Whether this job is flipping patties for the local burger joint or assembling a working nuclear submarine from staples, a job is a job. It puts food on the table, pays the bills, and allows the average worker ant to enjoy the conveniences and luxuries of the modern world from movies and popcorn to I-pods and mink coats. Money, however, is not the only motivation for adults to stick to their professions. As a matter of fact, many build a career on jobs that pay very little or none at all. They offer their services to the poor and the uneducated to support causes that are close to their heart and help other people better themselves. Interestingly, humans and jobs have one thing in common - both undergo evolution. And, if people change all the time, so do jobs. Jobs change according to the demands of society. During the Victorian era, when Britain was at its mightiest and the Industrial Evolution was moving at its fastest, people moved from the countryside to cities where work abounds for those who do not mind getting their hands dirty. These jobs are now dubbed the worst jobs in history - and it's easy to see why. Tanners de-flesh and de-hair cow hide from daybreak to nightfall. Engine cleaners crawl into the bowels of huge steam locomotives to give them a good clean-up, in steamy temperatures and complete darkness. Gut girls stand on benches by the docks where they catch, slit open, and rip out the gut of thousands of fish before throwing each one into a barrel - a process that should take no more than a second per fish from start to finish. Fortunately, jobs and the job descriptions that go with them have changed greatly since then. And, while there are still many jobs today that involve sweating buckets and getting the hands dirty - as shown only too well by Mike Rowe's Dirtiest Jobs - there are now as many white-collar jobs as there are blue-collar ones. Employers actively compete to draw the best and the brightest to their workplaces through bigger paychecks, flexible work schedules, special perks, and more comprehensive healthcare benefits. What future jobs will be like no one can tell for sure. One thing is certain, however. For as long as society has work that needs doing, there will always be a job and a person willing to do it.