Duolingo Cofounder Luis von Ahn has been working in tech for a while. When he was a 21-year-old grad student he gave the world CAPTCHA—better known to billions of internet users as those annoying squiggly letters that you have to transcribe to prove that you are not a bot. And as cofounder of the world’s most popular language app, he’s been around long enough to know some things about business. Von Ahn gives advice for young entrepreneurs from doing the right thing, to his perspective on the role of fundraising in your company. Read the full profile on Forbes: www.forbes.com/sites/glendatoma/2020/05/28/six-new-unicorns-one-acquisition-and-four-companies-with-200-plus-layoffs-how-last-years-next-billion-dollar-startups-have-fared/#660ead5c2fba Subscribe to FORBES: www.youtube.com/user/Forbes?sub_confirmation=1 Stay Connected Forbes newsletters: newsletters.editorial.forbes.com Forbes on Facebook: fb.com/forbes Forbes Video on Twitter: www.twitter.com/forbes Forbes Video on Instagram: instagram.com/forbes More From Forbes: forbes.com Forbes covers the intersection of entrepreneurship, wealth, technology, business and lifestyle with a focus on people and success.