Friday, July 25, 12:30 p.m.-ish: I take my seat for the latest big-screen edu-tainment at the Putnam Museum, and can't imagine a better way to begin my third quadruple feature of the month. For one thing, the movie I'm at is only 40 minutes long, which will shorten my work day considerably. For another, the movie is all about pandas. Pandas! Who doesn't love pandas? I figure that, at worst, the National Geographic presentation Pandas: The Journey Home will be adorable. So I'll admit to some more-than-mild surprise when, not 10 minutes into the film, we're treated to the (tasteful) sight of a female panda being artificially inseminated, right after witnessing the (tasteful) sight of a male panda mating with her. Hmmm, I think. Didn't see that in Disney's Bears.