question: OPTIONS:
- yes
- no
Periodic events and periodic motion have long served as standards for units of time.
Periodic events and periodic motion have served as standards for what?

answer: yes

question: OPTIONS:
- yes
- no
During this period winter sports were slowly introduced: in 1882 the first figure skating championship was held in St. Moritz, and downhill skiing became a popular sport with English visitors early in the 20th century, as the first ski-lift was installed in 1908 above Grindelwald.
When was the first figure skating championship held?

answer: yes

question: OPTIONS:
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- no
The teachings of the Czech priest Jan Hus were based on those of John Wycliffe, yet his followers, the Hussites, were to have a much greater political impact than the Lollards.
What were the followers of Jan Hus called?

answer: yes

question: OPTIONS:
- yes
- no
Philadelphia alone has 67 National Historic Landmarks, the third most of any city in the country.
What famous writer has a house in Philadelphia?

answer:
no