colleagues have also stayed close. >> x minus 1 equals zero. >> when a typhoon decimated areas in 2013, causing widespread destruction, efren mobilized his team to help in one of the hardest hit areas. he also issued a rallying cry to his fellow cnn heros. >> i contacted all my co-honorees. they responded. henley was there. he was able to bring water filters to each community. robin lim was there, also, to help pregnant women. when the three of us met together, we were like avengers coming together to help the community. >> today, efren is 35 years old. he works on his project full time and teaches a math class. he continues to push his cart.