Tiny tarsiers - one of my favorite non-human primates - are often thought to be quiet and adorable. Well, they're still adorable, but it turns out that they aren't so quiet - they actually have ultrasonic screams!
And for something completely different, here is a thought-provoking discussion of some of the drawbacks of BMI. Yes, BMI is useful as a general indicator, but I didn't realize that another measure - belly circumference, is likely even better at predicting obesity-related disease susceptibility. Cool.