Leonard Nimoy, who played the most famous TV scientist of all time, Mr. Spock, came from an arts and theater background and in real life is nothing like his character. Yet he told me that because Mr. Spock and “Star Trek” have inspired so many young viewers to become scientists, researchers who meet him are always desperate to give him lab tours and explain the projects they’re pursuing in peer-to-peer terms. Mr. Nimoy nods sagely and intones to each one, ‘Well, it certainly looks like you’re headed in the right direction.’