The best business ideas often seem laughable at first glance. So if you’re hearing a chorus of “No’s” — it may actually be a good sign. So don’t be discouraged by rejection. Instead, learn the different kinds of “no.” That’s what Tristan Walkder did. After stints at successful startups, he launched Walker & Company, makers of the Bevel razor, and learned the secret of how to talk with investors who may or may not share your vision.