 With all of these surveillance devices that are almost commonly available to police departments all over the place. You know, depending on the city and the budget, of course. Well, right here it is. Scientists can now use Wi-Fi to see through people's walls. And I find this one to be very interesting indeed. Do you remember? We must get rid of lead paint. We have to get rid of lead-based paint. We just have to get rid of it. Why? Well, the children. What about them?