Nine-year-old Aanya Thakur and her 14-year-old brother Ishaan are not your typical siblings. It became clear this past summer in Frisco, TX when the siblings wanted to learn how to mine digital coins while earning money. Little did they know their curiosity would lead to earning over $30,000 per month by tapping into cryptocurrencies. How you may ask? The duo mined bitcoin — the world’s leading cryptocurrency — ether and ravencoin, CNBC reports. “Crypto mining is just like mining for gold or diamonds,” Ishaan said in an interview with CNBC. “Instead of using shovels, you mine with computers. Instead of finding a piece of gold or a diamond in the mine, you find a cryptocurrency.”