What is a positive-pressure self-contained breathing apparatus?

Is it normal to wear a bra in the shower? Can MDF observe water? What happens when you beat fire boy and water girl? Is Joan Wasser a lesbian? Why do surfers stay in the same place while waiting for a wave? Why it is easier to lift a heaby stone under water than it air? How do you say 'let's go swimming' in Hawaiian? Where do swimming pool water bugs come from? What is the second wettest English county? What is the best way to remove oily Scum from the pool tile? Do all sit inside kayaks need a wet skirt? How to write a speech describing three actions you plan to take to protect supplies of freshwater? Is bamboo flooring waterproof? When was memorial stadium in Baton Rouge flooded for water skiing? Why can't we cry underwater? Do you close all the valves when adding new earth to the pool? Can you see sting rays in Hawaii when snorkeling? What is round as a dish pan deep as a tub but will never fillup? What are rain chaps? Why bagabas daet camarines norte is the best area for surfing in region v?