Problem: Temporal measurement, chronometry, takes two distinct period forms: the calendar, a mathematical tool for organizing intervals of time, and the clock, a physical mechanism that counts the passage of time. In day-to-day life, the clock is consulted for periods less than a day whereas the calendar is consulted for periods longer than a day. Increasingly, personal electronic devices display both calendars and clocks simultaneously. The number (as on a clock dial or calendar) that marks the occurrence of a specified event as to hour or date is obtained by counting from a fiducial epocha central reference point.
What is a mathematical tool used for organizing intervals of time?
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Answer: the calendar

Problem: The PV industry has seen drops in module prices since 2008. In late 2011, factory-gate prices for crystalline-silicon photovoltaic modules dropped below the $1.00/W mark. The $1.00/W installed cost, is often regarded in the PV industry as marking the achievement of grid parity for PV. These reductions have taken many stakeholders, including industry analysts, by surprise, and perceptions of current solar power economics often lags behind reality. Some stakeholders still have the perspective that solar PV remains too costly on an unsubsidized basis to compete with conventional generation options. Yet technological advancements, manufacturing process improvements, and industry re-structuring, mean that further price reductions are likely in coming years.
What is a sign that further price reductions are likely in coming years?
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Answer: technological advancements

Problem: Chinese officials canceled the torch relay ceremony amidst disruptions, including a Tibetan flag flown from a window in the City Hall by Green Party officials. The third torchbearer in the Paris leg, Jin Jing, who was disabled and carried the torch on a wheelchair, was assaulted several times by unidentified protestors seemingly from the pro-Tibet independent camp. In interviews, Jin Jing said that she was "tugged at, scratched" and "kicked", but that she "did not feel the pain at the time." She received praise from ethnic Chinese worldwide as "Angel in Wheelchair". The Chinese government gave the comment that "the Chinese respect France a lot" but "Paris [has slapped] its own face."
Who put a flag of Tibet out of the window at City Hall?
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Answer:
Green Party officials.