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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...

The pictures are made by Douglas H. Wheelock, who is an astronaut aboard the International Space Station. Douglas Harry "Wheels" Wheelock is a United States Army officer and a NASA astronaut. He flew on Space Shuttle mission STS-120 as a Mission Specialist. He was born May 5, 1960 in Binghamton, New York and considers Windsor, to be his hometown. Married to Cathleen Hollen, they have one child. Doug’s parents, Olin and Margaret Wheelock, reside in Windsor, New York...

The word geek is a slang term, noting individuals as "One who is perceived to be overly obsessed with one or more things including those of intellectuality, electronics, etc." Formerly, the term referred to a carnival performer often billed as a wild man whose act usually includes biting the head off a live chicken, bat, snake or bugs. The 1976 edition of the American Heritage Dictionary included only the definition regarding geek shows...