| 70 :04x01 - Big Animal Vet (Jan/08/2008) | | Mike gets a close up look at a Llama with an abscessed tooth when he joins a big animal veterinarian in Montana. Also, working in a barbecue joint in Georgia and a trip to New Jersey where he helps dig up old oil tanks. | |
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| 71 :04x02 - Steel Mill Worker (Jan/15/2008) | | Mike works with metal as he heads to St. Louis to melt scraps steel into molten metal and then works on a demolition team aboard a river barge. | |
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| 72 :04x03 - Cave Biologist (Jan/22/2008) | | Mike joins a cave biologist as they trek through muck and searches for slime eels hidden in piles of mucus. | |
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| 73 :04x04 - Buoy Cleaner (Jan/29/2008) | | Mike learns how they make shingles when he travels to Oregon, and then cleans dirty buoys while aboard a Coast Guard ship. | |
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| 74 :04x05 - Cranberry Farmer (Feb/05/2008) | | Mike heads to South Carolina where he learns how to make bricks by hand, and then tries his hand at farming cranberries while in Oregon. | |
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| 75 :04x06 - Mud Mineral Excavator (Feb/12/2008) | | Mike prepares for a gem and mineral show by digging in Death Valley. also, birds are rescued from a salty lake, and then it's off to South Carolina for a day of working on a rice plantation. | | Guest Stars: Campbell Coxe as Himself | |
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| 76 :04x07 - Tight Spaces (Feb/19/2008) | | Mike looks back at some of his tightest squeezes from the dirtiest, most challenging jobs over the years. | |
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| 78 :04x09 - Dirty Jobs of the Big Apple (Apr/14/2008) | | Mike heads to New York City where he climbs to the top of a huge building to assist in creating a water tower, followed by learning the art of repairing an elevator. | |
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| 79 :04x10 - Floating Fish Factory (Apr/21/2008) | | Mike takes an epic trip aboard a fish processing ship while in Alaska. The job gives Mike a new appreciation for those who bring in fish for our meals daily. | |
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| 80 :04x11 - Dairy Cow Midwife (Apr/28/2008) | | Mike makes a stop in Indiana where he learns to milk a cow and then clean it's udders. Also, a schooling on how to artificially inseminate a cow and assist on a calf delivery. | |
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| 81 :04x12 - Aerial Tram Greaser (May/05/2008) | | Mike learns about erosion control as he visits the site of a future California neighborhood. Next, Mike helps with the maintenance and repair a tram while 8,500 feet above Palm Springs. | |
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| 82 :04x13 - Turkey Inseminator (May/12/2008) | | Mike attempts to make a home more energy efficient, which calls for him to crawl beneath the dwelling through falling insulation, dead rats and debris Then, he takes a crack at turkey inseminating while on a turkey farm full of large breasted birds. | |
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| 83 :04x14 - Ice Salvage Crew (May/19/2008) | | Mike helps with an oil spill clean up in Alaska, and then travels to Minnesota where he assists on retrieving a car from a lake which had fallen through the ice. | |
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| 84 :04x15 - Wind Farm Technician (Jun/02/2008) | | Mike heads to Oklahoma to help turn a farm green by the use of wind. Then, it's off to Kentucky where a sink hole has been filled with garbage by its citizens. | |
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| 85 :04x16 - Animal Barber (Jun/09/2008) | | Mike head to Kalispell, Montana and the Spring Brook Ranch for his 150th dirty job as he joins a yak and bison rancher. It's a wild celebration of dirt as Mike and the crew go to work. | |
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| 86 :04x17 - Brown Before Green (Jun/16/2008) | | Mike reviews past jobs which helped the environment, including geothermal drilling, wood and tire salvage and building cobb homes. The one constant is that to become green, you usually have to get brown first. | |
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