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Although a number of human activities are conducted underwater—such as research, scuba diving for work or recreation, or even underwater warfare with submarines—this very extensive environment on planet Earth is hostile to humans in many ways and therefore little explored. An immediate obstacle to human activity under water is the fact that human lungs cannot naturally function in this environment...

Strangely enough, such a thing as an Easter tree already exists, and it can be found in Germany. Around 1945, when he was just a young boy, Volker Kraft saw his very first Easter Tree (Eierbaum, Osterbaum or Ostereirbaum, in German), and decided he would have one of his very own, when he grew up. Time passed and young Volker became a married man, with a family and everything. But his childhood dream stuck with him and he decorated his first Easter Tree, in 1965. He used 18 colored plastic eggs...

The process has to be started as soon as possible after the flowers have been pollinated and the fruit has begun to form. Then you have to practise your own version of selection before the June "drop", when a proportion of fruit falls from the tree naturally. Suppose you choose a branch with five fruits: remove two and use the remaining three for bottling. This should avoid your chosen fruit dropping prematurely and wasting your efforts...

A boat is a watercraft of modest size designed to float or plane, to provide passage across water. Usually this water will be inland (lakes) or in protected coastal areas. However, boats such as the whaleboat were designed to be operated from a ship in an offshore environment. In naval terms, a boat is something small enough to be carried aboard another vessel (a ship). Strictly speaking and uniquely a submarine is a boat as defined by the Royal Navy...

U.S. transit agencies beefed up security as a precaution Monday after the double suicide bombing in Moscow's subway system, sending more police into stations and officers to conduct random inspections of rail yards. Metro police conducted random inspections of stations and rail yards, officials said. Atlanta's public transit system said its police department increased the number of officers and patrols throughout the system...

A pencil is a writing implement or art medium usually constructed of a narrow, solid pigment core inside a protective casing. The case prevents the core from breaking, and also from marking the user’s hand during use. Pencils create marks via physical abrasion, leaving behind a trail of solid core material that adheres to a sheet of paper or other surface. They are noticeably distinct from pens, which dispense liquid or gel ink that stain the light color of the paper...

A POTD is an acronym for "Photo of the Day", "Picture of the Day", "Post of the Day" or "Poll of the Day". It is a term most commonly used by online digital photography communities as an honor to outstanding photos that are selected daily from among that community's membership. They can either be tagged as POTD or displayed in a special page on that site...