Our picks for the week of July 19-25: 

Get Fresh: It's the new, grassroots food film that you can screen in your living room.

Clean, green, high-tech machines: 5 cool car trends to watch.

Media Mayhem: Cheer up! All the environmental headlines aren't gloom and doom.

Fresh faces: MNN introduces 40 farmers under 40.

Pop quiz: Jonathan Kesselman surprises visitors to New York's Times Square with an eco-quiz. Watch the video.

Breathe deep ... or not: Learn how fine particulates can damage your lungs. Translating Uncle Sam explains.

A step up from Billy Beer: Kid Rock works with a biodiesel-powered brewery to create a light, American-style lager.

Temperature check: Nate Silver challenges climate change skeptics over temperature.

Sarah Palin's tweets: The soon-to-be-former governor of Alaska tweets about oil, Alaska and mother bears.

10 eco-scholarships: Resources for financially strapped, green-minded students.

MNN week in review 7/25/2009
This week's best bets from the Mother Nature Network. 7/25/2009