Photo: youngrobv (flickr)

A bike can change a life.

The benefits of a bike can range from awakening your inner child to being an eco-friendly commuter. In a developing country, however, the simple bike becomes a locally sustainable method of alleviating poverty and building healthy communities.

The bicycle means greater access to educational and economic opportunities. (Cool fact: A bike can go three or four times faster than the pedestrian and uses five times less energy.) But in communities where people make only a few hundred dollars a year, a bicycle that costs an average of $100 is financially out of reach.

To help bridge the gap, various organizations have sprung up as bicycle distributors for developing communities mostly in Africa.

World Bicycle Relief, an organization fighting the HIV/AIDS crisis in Zambia, describes the power of bicycles in its mission statement:

Simple, sustainable transportation is an essential element in disaster assistance and poverty relief. Bicycles fulfill basic needs by providing access to healthcare, education and economic development. Bicycles empower individuals, their families, and their communities. Our mission is to provide access to independence and livelihood through The Power of Bicycles.

Organizations like this depend on donated bikes, which they then ship to community-based organizations that employ and train locals as bike mechanics. In Namibia, the Bicycling Empowerment Network has bicycle workshops (called Bicycle Empowerment Centres) stocked with tools and bicycle parts that act as the hub for bike distribution and repairs.

Even grassroots groups in the U.S. have joined the cause. Bikes to Rwanda, a project supported by Stumptown Coffee in Portland, Ore., ships cargo bicycles to farmers in a Rwandan coffee cooperative.

With today’s gas prices, cycling is a more attractive alternative for residents of places from Amsterdam to Zambia. But bikes aren't limited to transport anymore. They can be modified to sharpen knives, double as an ambulance, and even filter and store water — all innovative adaptations geared towards positive social change.

Ciclovía Documentary shot by Streetfilms

Bogotá, Colombia is holding a 70-mile long block party. And everyone’s invited.

Ciclovía — "bike path" in Spanish — is an event that closes down major roads for pedestrian use every Sunday and holiday from 7 a.m. to 2 p.m. Created in 1976, it rapidly grew from eight miles and 140,000 bicyclists to 70 miles and an average of 1.5 million weekly riders. Ciclovía is championed as a community building event that attracts people from all backgrounds for a day of biking, walking, skating and dancing in the streets.

In the above video, Bogota’s former park commissioner Guillermo (Gil) Penalosa discusses Ciclovía’s main appeal: social integration.

You will see people in $5,000 bikes and others in $50 bikes, and all having the same fun! Rich and poor, young and old, men and woman, tall or short... ALL!

Cited for “endless benefits” such as the improvement of personal and public health, Ciclovía has inspired other cities to develop similar programs, including Guadalajara, Mexico; Quito, Ecuador; Santiago, Chile; and Paris, where an expressway along the Seine is transformed into a pedestrian refuge one month out of the summer.

Cities in the U.S. are also developing similar programs, starting with El Paso, Texas. This Sunday Portland, Ore., is clearing 6 miles of roadway for six hours in its inaugural "Sunday Parkways." New York Mayor Michael Bloomberg announced his city's plans for Ciclovía-like event this August that would stretch from 72nd to the Brooklyn Bridge along Park Avenue.

Events such as Ciclovía are not only free, but they also bring all sorts of people together to get healthy and build a happy community. It seems like a no-brainer that every city should have a Ciclovía!

This isn't an adult tricycle, it's an innovative way to reduce the number of people — estimated at 1.1 billion — who lack access to clean drinking water.

The Aquaduct is essentially a bicycle that can transport and filter up to 20 gallons of water at a time.

It's simple to use: Just ride to your local water source and pour water into the rear holding tank. As you ride home, the pedaling forces the water through a filtration system and into a smaller holding tank in the front. You can also filter the water by pedaling in place.

Watch the video to see how it all works.