Problem: From the German point of view, March 1941 saw an improvement. The Luftwaffe flew 4,000 sorties that month, including 12 major and three heavy attacks. The electronic war intensified but the Luftwaffe flew major inland missions only on moonlit nights. Ports were easier to find and made better targets. To confuse the British, radio silence was observed until the bombs fell. X- and Y-Gerät beams were placed over false targets and switched only at the last minute. Rapid frequency changes were introduced for X-Gerät, whose wider band of frequencies and greater tactical flexibility ensured it remained effective at a time when British selective jamming was degrading the effectiveness of Y-Gerät.
Why was the X-Gerat frequencies used more?
The answer is the following: British selective jamming was degrading the effectiveness of Y-Gerät

Problem: In 1887, the British Empire celebrated Victoria's Golden Jubilee. Victoria marked the fiftieth anniversary of her accession on 20 June with a banquet to which 50 kings and princes were invited. The following day, she participated in a procession and attended a thanksgiving service in Westminster Abbey. By this time, Victoria was once again extremely popular. Two days later on 23 June, she engaged two Indian Muslims as waiters, one of whom was Abdul Karim. He was soon promoted to "Munshi": teaching her Hindustani, and acting as a clerk. Her family and retainers were appalled, and accused Abdul Karim of spying for the Muslim Patriotic League, and biasing the Queen against the Hindus. Equerry Frederick Ponsonby (the son of Sir Henry) discovered that the Munshi had lied about his parentage, and reported to Lord Elgin, Viceroy of India, "the Munshi occupies very much the same position as John Brown used to do." Victoria dismissed their complaints as racial prejudice. Abdul Karim remained in her service until he returned to India with a pension on her death.
Who was Karim accused of spying for by Victoria's family? 
The answer is the following: Muslim Patriotic League

Problem: John had spent the conflict travelling alongside his father, and was given widespread possessions across the Angevin empire as part of the Montlouis settlement; from then onwards, most observers regarded John as Henry II's favourite child, although he was the furthest removed in terms of the royal succession. Henry II began to find more lands for John, mostly at various nobles' expense. In 1175 he appropriated the estates of the late Earl of Cornwall and gave them to John. The following year, Henry disinherited the sisters of Isabelle of Gloucester, contrary to legal custom, and betrothed John to the now extremely wealthy Isabelle. In 1177, at the Council of Oxford, Henry dismissed William FitzAldelm as the Lord of Ireland and replaced him with the ten-year-old John.
When did Henry II appropriate the estates of the late Earl of Cornwall?
The answer is the following: 1175

Problem: Apple's application to the United States Patent and Trademark Office for a patent on "rotational user inputs", as used on the iPod interface, received a third "non-final rejection" (NFR) in August 2005. Also in August 2005, Creative Technology, one of Apple's main rivals in the MP3 player market, announced that it held a patent on part of the music selection interface used by the iPod line, which Creative Technology dubbed the "Zen Patent", granted on August 9, 2005. On May 15, 2006, Creative filed another suit against Apple with the United States District Court for the Northern District of California. Creative also asked the United States International Trade Commission to investigate whether Apple was breaching U.S. trade laws by importing iPods into the United States.
When did Apple receive a decision on its attempt to patent rotational user inputs?
The answer is the following:
August 2005