The Fitbit Flex is an activity tracker aimed at measuring your exercise, diet and sleep. The device was my constant companion for about a week, and by the end of it, I felt informed about my activity levels, and was motivated to get moving.
Whether we like it or not, we're constantly judging the intelligence of others, estimating their level of competence by evaluating their responses to our questions. Some people are better at detecting intelligence than others, but that doesn't mean you can't learn how. With practice, you should be able to gauge the intelligence of others with a decent degree of accuracy, though you should always be prepared for surprises.
The IQ scale is open-ended. Your IQ is 100 times your mental age divided by your actual age. Mental age is the age at which your IQ test results would be average. So let's say you're 10 years old, but your IQ test results are those of an average 12 year old. Your IQ would be 100 x 12 / 10, or 120. If you are 10 years old and your IQ is 80, your IQ test results are average for an 8 year old.