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John Warrillow, author of Built to Sell, answers questions from readers about building a sellable business. Dear John: I have an idea for a business, but there is already a lot of competition.

Uploading your music to the cloud isn't as simple as you might think. As more data is stored online, the cloud takes more and more energy to maintain, forcing companies to get into the business of getting power as cheaply as possible

Forget sending huge, expensive remote-controlled robot probes to Mars--could a swarm of smaller, cheaper units that roam the surface using honeybee-like thinking actually do the job better? Just last week, NASA's next Martian rover Curiosity got its first taste of Mars-like conditions inside a pressure and atmospheric chamber designed to simulate the kind of environment it'll encounter when it actually lands on Mars's regolith several years from now. It's a huge, complex process to get this huge (9-foot long, 2,000 pound), complex vehicle ready for its scientific mission