Newest wrinkle in rocketry is the “plug nozzle” engine. In the conventional rocket engine, fuel is burned in a roughly spherical combustion chamber, and turns into hot, high-pressure gas. To keep the ...

Walking outdoors with an ice cream cone in hand is one of the most pleasurable parts of summer. That is, until your perfectly scooped ice cream starts to melt. When that happens, it doesn't take long ...