Need a holiday gift for the gadget, game or physics enthusiast in your life? Check out Mad Science: Einstein’s Fridge, Dewar’s Flash, Mach’s Speed, and 362 Other Inventions and Discoveries That Made Our World, edited by Randy Alfred. As discussed on this week’s show, the $20 book collects a year’s worth of entries from Wired’s This Day in Tech feature in one convenient place. The nicely compiled book makes for quick, informative reading on those topics dear to geek hearts: math, science, history, unraveling the mysteries…