Dear Dr. Roach: My brother is 74 and has edema in his legs and feet. He doesn’t exercise; he basically just sleeps and plays games on his computer. His bedroom is upstairs, and he struggles going up ...

Right now, there’s a fly walking on the window in my office. I asked my friend Rich Zack how it does that. He’s an insect scientist at Washington State University. It turns out my window isn’t as ...