q... Context: Conservation refers to a logical thinking ability which, according to the psychologist Jean Piaget, is not present in children during the preoperational stage of their development at ages 2 -- 7, but develops in the concrete operational stage at ages 7 -- 11. Conservation refers to the ability to determine that a certain quantity will remain the same despite adjustment of the container, shape, or apparent size.

Question: in which stage of cognitive development does the conservation concept first appear?
a... To answer this question, we should know that: Conservation refers to a logical thinking ability which, according to the psychologist Jean Piaget, is not present in children during the preoperational stage of their development at ages 2 -- 7, but develops in the concrete operational stage at ages 7 -- 11.
The answer is the concrete operational stage at ages 7 -- 11


q... Lewis Hamilton holds the record for the most pole positions, having qualified first on 73 occasions. Michael Schumacher is second with 68 pole positions. Ayrton Senna is third with 65 poles. Senna holds the record for the most consecutive poles; he qualified in first place eight Grands Prix in a row from the 1988 Spanish Grand Prix to the 1989 United States Grand Prix. Sebastian Vettel is the youngest polesitter, he was 21 years, 72 days old when he qualified in first place for the 2008 Italian Grand Prix. The oldest person to qualify in pole position was Nino Farina, who was 47 years, 79 days old when he was polesitter for the 1954 Argentine Grand Prix. As of the 2017 Abu Dhabi Grand Prix, 98 drivers have been on pole position in the 976 Grands Prix since the first World Championship race, the 1950 British Grand Prix. From 2014 onwards the driver who achieves the most pole positions in a season is awarded the Pole Trophy. The inaugural Pole Trophy was won by Nico Rosberg; the 2015, 2016 and 2017 Trophies were won by Lewis Hamilton.

Based on this passage, who has the most pole positions in formula 1?
a... To answer this question, we should know that: Lewis Hamilton holds the record for the most pole positions, having qualified first on 73 occasions.
The answer is Lewis Hamilton


q... William McKinley (January 29, 1843 -- September 14, 1901) was the 25th President of the United States, serving from March 4, 1897 until his assassination in September 1901, six months into his second term. McKinley led the nation to victory in the Spanish -- American War, raised protective tariffs to promote American industry, and maintained the nation on the gold standard in a rejection of free silver (effectively, expansionary monetary policy).

Answer this question based on the passage: who was the president of the united states in 1900?
a... To answer the above question, the relevant sentence is: William McKinley (January 29, 1843 -- September 14, 1901) was the 25th President of the United States, serving from March 4, 1897 until his assassination in September 1901, six months into his second term.
The answer is William McKinley


q... "High School" is a song by Trinidadian-American rapper and singer Nicki Minaj featuring American rapper Lil Wayne for Minaj's reissued second studio album Pink Friday: Roman Reloaded -- The Re-Up (2012). It was released on April 16, 2013, by Young Money, Cash Money, and Republic as the third single from the record. The song was written and produced by Boi-1da and T-Minus, with additional songwriting provided by Minaj and Lil Wayne. "High School" is a hip hop and R&B song that lyrically discusses adultery. The song peaked at number 64 on the U.S. Billboard Hot 100, and additionally reached numbers 15 and 20 on the Billboard Hot Rap Songs and Hot R&B / Hip-Hop Songs component charts. Elsewhere, the track charted moderately throughout international singles charts, including number 31 on the UK Singles Chart. It is also the only song of Nicki Minaj to be released in 2013.

Answer this question: when did the song high school by nicki minaj come out?
a...
The important part for answering this question is: It was released on April 16, 2013, by Young Money, Cash Money, and Republic as the third single from the record.
The answer is April 16 , 2013