The stratosphere (/ËstrÃ¦tÉËsfÉªÉr, -toÊ-/) is the second major layer of Earth's atmosphere, just above the troposphere, and below the mesosphere. About 20% of the atmosphere's mass is contained in the stratosphere.
The chainsaw is a highly effective and efficient tree and branch cutting power tool. It works with an engine, referred to as a power head; powering a metal chain, driven by a centrifugal clutch, with a chain moving around a groove in the guide bar at fast speeds.
A Jacob's Ladder unfolded. Watch toy in action (Ogg Theora format, 1.7 MB) (clip info) A Jacob's ladder (also magic tablets, Chinese blocks, and klick-klack toy) is a folk toy consisting of blocks of wood held together by strings or ribbons. It is a toy that does some very weird things.. When the ladder is held at one end, blocks appear to cascade down the strings.