Problem: Text: A metal-halide lamp is an electrical lamp that produces light by an electric arc through a gaseous mixture of vaporized mercury and metal halides (compounds of metals with bromine or iodine). It is a type of high-intensity discharge (HID) gas discharge lamp. Developed in the 1960s, they are similar to mercury vapor lamps, but contain additional metal halide compounds in the quartz arc tube, which improve the efficiency and color rendition of the light. The most common metal halide compound used is sodium iodide. Once the arc tube reaches its running temperature, the sodium dissociates from the iodine, adding orange and reds to the lamp's spectrum from the sodium D line as the metal ionizes. As a result, metal-halide lamps have high luminous efficacy of around 75--100 lumens per watt, which is about twice that of mercury vapor lights and 3 to 5 times that of incandescent lights and produce an intense white light. Lamp life is 6,000 to 15,000 hours. As one of the most efficient sources of high CRI white light, metal halides as of 2005 were the fastest growing segment of the lighting industry. They are used for wide area overhead lighting of commercial, industrial, and public spaces, such as parking lots, sports arenas, factories, and retail stores, as well as residential security lighting and automotive headlamps (xenon headlights).

Question: is metal halide the same as mercury vapor?

OPTIONS:
- no
- yes
A: no

Problem: Text: In baseball, a pitcher can commit a number of illegal motions or actions that constitute a balk. Most of these violations involve a pitcher pretending to pitch when he has no intention of doing so. In games played under the Official Baseball Rules, a balk results in a dead ball or delayed dead ball. In certain other circumstances, a balk may be wholly or partially disregarded. Under other rule sets, notably in the United States under the National Federation of High Schools (Fed or Federation) Baseball Rules, a balk results in an immediate dead ball. In the event a balk is enforced, the pitch is generally (but not always) nullified, each runner is awarded one base, and the batter (generally) remains at bat, and with the previous count. The balk rule in Major League Baseball was introduced in 1898.

Question: does batter go to first on a balk?

OPTIONS:
- no
- yes
A: no

Problem: Text: The Religious Society of Free Quakers, originally called ``The Religious Society of Friends, by some styled the Free Quakers'', was established on February 20, 1781 in Philadelphia, Pennsylvania. More commonly known as Free Quakers, the Society was founded by members of the Religious Society of Friends, or Quakers, who had been expelled for failure to adhere to the Peace Testimony during the American Revolutionary War. Many of its early members were prominent Quakers involved in the American Revolution before the society was established. Notable Free Quakers at the early meetings include Lydia Darragh and Betsy Ross. Following the end of the American Revolutionary War, the number of Free Quakers began to dwindle as some members died and others were either accepted back into the Society of Friends or by other religious institutions. There is a small group of Free Quakers in Indiana who continue the tradition of the Five Principles (Inner Light, peace, simplicity, justice, stewardship) and the Five Freedoms (from creeds, from clergy, from public worship, from organized membership, from evangelization). Today, the descendants of the original Free Quakers hold an annual meeting of the Religious Society of Free Quakers at the Free Quaker Meetinghouse in Philadelphia, Pennsylvania.

Question: are there still quakers in the united states?

OPTIONS:
- no
- yes
A:
yes