<p><img src="https://images.cointelegraph.com/images/528_aHR0cHM6Ly9zMy5jb2ludGVsZWdyYXBoLmNvbS91cGxvYWRzLzIwMjUtMDYvMDE5N2E1Y2MtY2Q0ZC03MTYxLTliMTgtNTdmNDg2ZGNiZTg1.jpg" alt="Everyone laughed at these 10 gadgets. Now, they’re in every home"></p><p>From robotic pets and digital currencies to virtual reality, some of the biggest innovations were once considered failures.</p>