A helping hand, eastern russia pal, a fourteen year old student. Stood beside his work at a science fair. IT was a robotic calm. He built IT out of plastic blocks and fishing line. Hello, said the girl with an artificial ARM. As SHE shook hands with eastern's work. This was the first time eastern met Jenny. A goal with a special condition. SHE was born without an ARM. Her artificial ARM was just a simple hook. But IT cost eighty thousand . dollars. What's worse, children like her grow quickly. And need new arms all the time. IT blew me away. I built my ARM for only three hundred dollars, thought eastern. I must lend a hand to people like her. After the fair eastern room became a lab. He stayed there all day. He always tried to improve his work. For his sixteen th birthday, eastern got a three d printer. And with IT he invented an artificial ARM. IT was able to move with brain signals of the user. But IT wasn't good enough yet. The ARM weight three point six kilograms. IT was too heavy for a child. Eastern kept working on IT. He enjoyed fixing problems one after another. And finally, he hit on success at age twenty three. His design only weight not point five kilograms. And cost around five hundred . dollars. Eastern invention has helped many . children. He didn't want to make money from IT. He decided to post his design online for free. People can download the design. And make an artificial ARM with their own three d printers. What a helping hand.