Here's a whole different kind of Google bus — one that could help change the lives of San Francisco's most needy.

San Francisco nonprofit Lava Mae just unveiled a trial version of a bus that provides showers for the 6,400 homeless people who live in the city by the Bay. It was funded in large part by a grant from Google, which gave the project $100,000 as part of its Google Impact Challenge.

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Lava Mae founder Doniece Sandoval, a marketing veteran and recent transplant to San Francisco, said such a mobile sanitary station was essential for the "human rights" of the city's homeless population, and would help lift them up out of what often seems like a hopeless situation.

"You’re living on the streets and you’re filthy, you’re trying to improve your circumstances," she told The Associated Press. "But you can’t interview for a job, you can’t apply for housing and you get disconnected from your sense of humanity.”

The nonprofit bought and refurbished a public transit bus at a cost of $75,000, thanks to that Google money; it boasts two bathrooms with free hot showers, shampoo, soap and towels. If that doesn't sound like a big deal, you may need to watch this:

The Google Impact Challenge is designed to provide grants of up to $500,000 to nonprofits with "bright ideas for a better Bay Area"; finalists are decided by public vote. The 2014 challenge, which ended in June, was the company's first to benefit the region. It came in the wake of months of criticism and protest that focused on Google's shuttle buses, which use public bus stops to transport thousands of employees to Mountain View and back.