The Obama administration took a major step Monday toward imposing the first federal limits on climate-changing pollution from cars, power plants and factories, declaring there was compelling scientific evidence that global warming from manmade greenhouse gases endangers Americans' health. Other compelling scientific evidence includes: Ground glass makes bad baby food. Objects dropped from moving cars tend to fall to the ground rather than disappearing or hovering just above the ground until they can be retrieved. The prime cause of obesity is eating too much. People are more likely to wash their hands when they are being watched. Ducks like water. "Cramming for exams" is not a long-term study strategy. Bad singers continue to hog the Karaoke machine whether they know they are bad singers or not. Bunk beds are dangerous, especially in conjunction with ceiling fans. Many people drink alcohol to increase their chances of "hooking up." In a related study, college-age heterosexual men who viewed images of women misidentified their body language and facial expressions as sexually suggestive twelve percent of the time. Those who work around alcohol tend to abuse it. Parents are more strict with older children. Sad people spend more when they are shopping. Allergies make you uncomfortable. It's healthier to take the stairs. Cell phones distract drivers. And that stuff at the bottom of the refrigerator you thought was food probably isn't. Tune in next week as we examine time as the cause of old age.