Problem: The scientific revolution is a convenient boundary between ancient thought and classical physics. Nicolaus Copernicus revived the heliocentric model of the solar system described by Aristarchus of Samos. This was followed by the first known model of planetary motion given by Johannes Kepler in the early 17th century, which proposed that the planets follow elliptical orbits, with the Sun at one focus of the ellipse. Galileo ("Father of Modern Physics") also made use of experiments to validate physical theories, a key element of the scientific method.
Who made the heliocentric model popular?
The answer is the following: Nicolaus Copernicus

Problem: In the 1950s, the recruitment of women was open to roles in medicine, communication, logistics, and administration. The roles of women in the CAF began to expand in 1971, after the Department reviewed the recommendations of the Royal Commission on the Status of Women, at which time it lifted the ceiling of 1,500 women personnel, and gradually expanded employment opportunities into the non-traditional areas—vehicle drivers and mechanics, aircraft mechanics, air-traffic controllers, military police, and firefighters. The Department further reviewed personnel policies in 1978 and 1985, after Parliament passed the Canadian Human Rights Act and the Canadian Charter of Rights and Freedoms. As a result of these reviews, the Department changed its policies to permit women to serve at sea in replenishment ships and in a diving tender, with the army service battalions, in military police platoons and field ambulance units, and in most air squadrons.
What year did further recruitment for women open in the CAF?
The answer is the following: 1971

Problem: Whereas SCIMs cannot turn a shaft faster than allowed by the power line frequency, universal motors can run at much higher speeds. This makes them useful for appliances such as blenders, vacuum cleaners, and hair dryers where high speed and light weight are desirable. They are also commonly used in portable power tools, such as drills, sanders, circular and jig saws, where the motor's characteristics work well. Many vacuum cleaner and weed trimmer motors exceed 10,000 rpm, while many similar miniature grinders exceed 30,000 rpm.
At around what RMP do miniature grinders operate?
The answer is the following: 30,000

Problem: Since 1972, International Telecommunication Union's radio telecommunications sector (ITU-R) had been working on creating a global recommendation for Analog HDTV. These recommendations, however, did not fit in the broadcasting bands which could reach home users. The standardization of MPEG-1 in 1993 also led to the acceptance of recommendations ITU-R BT.709. In anticipation of these standards the Digital Video Broadcasting (DVB) organisation was formed, an alliance of broadcasters, consumer electronics manufacturers and regulatory bodies. The DVB develops and agrees upon specifications which are formally standardised by ETSI.
What does DVB stand for?
The answer is the following:
Digital Video Broadcasting