From BBC News By- Kamala Thiagarajan Edited by - Amal Udawatta Sai Krishan, Thirunelly Tribal Special Intervention Programme Lakshmi and Shantha with a species of tuber locally called the Noorang (Credit: Sai Krishan, Thirunelly Tribal Special Intervention Programme) In a tribe in southern India, a group of women are working hard to revive the country's ancient native tubers, and bring them back into everyday culture. Lakshmi spends several hours each day digging out large lumpy and hairy yam tubers, starchy roots that grow below the soil. Some weigh an unwieldy 5kg (11lb) and are 4.5ft-long (1.4m), almost as tall as she is. It's painstaking work, says 58-year-old Lakshmi, who goes by one name. First, she has to cut out the thick shoot above the ground. Then, she uses shovels to dig up the earth around the buried stem and a paddle-like flat chisel to gently pry out the tuber. She uses her hands to dig the tuber out of the ground to avoid damaging its delicate...