You may have a mouth ulcer if you have: 1  A painful sore or sores inside your mouth, on the tongue, soft palate (the back portion of the roof of your mouth), or inside your cheeks. 2  Sores in your mouth that are round, white, or grey in colour, with a red edge or border.
Perpetually moving minecart track. Works underwater and above. Upvote this! http://redd.it/m9zrx. If you are using this for survival, make sure you have air bubbles along the way (such as signs) so you can breath. Song: Rainy Day in Paris: http://www.newgrounds.com/audio/liste...
similar to a Cartesian diver? How about a submarine? Indeed, a Cartesian diver and a submarine work in similar ways. When the submarine is ready to dive, it takes water into tanks until its mass is enough to make the submarine sink. This increased mass caused by the water in the tanks increases the density of the submarine and it descends.