Could parachute-wearing bears sniff out Osama bin Laden? That’s one suggestion the Pentagon has received from someone who noted, quite correctly, that a bear’s sense of smell is much more powerful than a bloodhound’s. “Overnight, Parachute some bears into areas [bin Laden] might be,” the innovator wrote. “Attempt to train bears to take off parachutes after landing, or use parachutes that self-destruct after landing.” The bears-in-the-air idea, and scores of others, came from people who clicked on the “contact us” button on the Defense Department’s Web site, which allows the general public to ask questions or make suggestions.