These days, health trackers aren't only around wrists or fingers collecting heart rate, sleep duration, and body temperature data. The latest ones are in toilets, sensing urine and monitoring biomarkers like hydration, nutrition, and more. Withings on Wednesday launched its U Scan Nutrio and U Scan Calci, two toilet urine sensors for nutrition and kidney stone tracking. Also: This new Kohler sensor is like a health detective in your toilet tiny camera and all The U Scan...