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The compactable bicycle concept was driven from the need of boosting urban space efficiency when it is not in use or being transported. The wheel is made of six modules, each with double pivot in their joints, allowing the wheel to be folded and become smaller. The spokes of the wheel are contained in the internal structure when you fold the bicycle and the spokes rotate to the system’s center where they attach with the center wheel...

A sexually transmitted disease (STD), also known as sexually transmitted infection (STI) or venereal disease (VD), is an illness that has a significant probability of transmission between humans or animals by means of human sexual behavior, including vaginal intercourse, oral sex, and anal sex...

A rotary snowplow is a piece of railroad snowfighting equipment. It is characterized by the large circular set of blades on its front end that rotate as a unit to cut through the snow on the track ahead of it. The rotary was invented by Canadian dentist J.W. Elliot in 1869, but a prototype wasn't built until the Leslie Brothers constructed one in 1883. Wedge snowplows were the traditional automated method of clearing snow from railroad tracks...

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...