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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...

However, there is also another aspect of inventions that are sophisticated, but not necessarily indispensable in daily life. In this category falls the Auto Ink, a machine made by Chris Eckert and serving, nothing more and nothing less than to make tattoos. The machine is a sculpture of three numerically controlled axes. Once the switch is activated, the operator assigns a religion and the symbol is tattooed on the arm of the person...

A curtain (sometimes known as a drape, mainly in the United States) is a piece of cloth intended to block or obscure light, or drafts, or water in the case of a shower curtain. Curtains hung over a doorway are known as portières. Curtains are often hung on the inside of a building's window to block the travel of light, for instance at night to aid sleeping, or to stop light from escaping outside the building (stopping people outside from being able to see inside, often for privacy reasons)...