Problem: Bitumen was used in early photographic technology. In 1826 or 1827, it was used by French scientist Joseph Nicéphore Niépce to make the oldest surviving photograph from nature. The bitumen was thinly coated onto a pewter plate which was then exposed in a camera. Exposure to light hardened the bitumen and made it insoluble, so that when it was subsequently rinsed with a solvent only the sufficiently light-struck areas remained. Many hours of exposure in the camera were required, making bitumen impractical for ordinary photography, but from the 1850s to the 1920s it was in common use as a photoresist in the production of printing plates for various photomechanical printing processes.[not in citation given]
Exposure to what natural element was necessary for early photographic plates?
The answer is the following: light

Problem: Forbes magazine began reporting on Beyoncé's earnings in 2008, calculating that the $80 million earned between June 2007 to June 2008, for her music, tour, films and clothing line made her the world's best-paid music personality at the time, above Madonna and Celine Dion. They placed her fourth on the Celebrity 100 list in 2009 and ninth on the "Most Powerful Women in the World" list in 2010. The following year, Forbes placed her eighth on the "Best-Paid Celebrities Under 30" list, having earned $35 million in the past year for her clothing line and endorsement deals. In 2012, Forbes placed Beyoncé at number 16 on the Celebrity 100 list, twelve places lower than three years ago yet still having earned $40 million in the past year for her album 4, clothing line and endorsement deals. In the same year, Beyoncé and Jay Z placed at number one on the "World's Highest-Paid Celebrity Couples", for collectively earning $78 million. The couple made it into the previous year's Guinness World Records as the "highest-earning power couple" for collectively earning $122 million in 2009. For the years 2009 to 2011, Beyoncé earned an average of $70 million per year, and earned $40 million in 2012. In 2013, Beyoncé's endorsements of Pepsi and H&M made her and Jay Z the world's first billion dollar couple in the music industry. That year, Beyoncé was published as the fourth most-powerful celebrity in the Forbes rankings. MTV estimated that by the end of 2014, Beyoncé would become the highest-paid black musician in history; she succeeded to do so in April 2014. In June 2014, Beyoncé ranked at #1 on the Forbes Celebrity 100 list, earning an estimated $115 million throughout June 2013 – June 2014. This in turn was the first time she had topped the Celebrity 100 list as well as being her highest yearly earnings to date. As of May 2015, her net worth is estimated to be $250 million.
When did Beyoncé become the highest paid black musician, ever?
The answer is the following: April 2014.

Problem: The first experimental radio license was issued in Philadelphia in August 1912 to St. Joseph's College. The first commercial broadcasting radio stations appeared in 1922: first WIP, then owned by Gimbel's department store, on March 17, followed the same year by WFIL, WOO, WCAU and WDAS. The highest-rated stations in Philadelphia include soft rock WBEB, KYW Newsradio, and urban adult contemporary WDAS-FM. Philadelphia is served by three major non-commercial public radio stations, WHYY-FM (NPR), WRTI (jazz, classical), and WXPN-FM (adult alternative music), as well as several smaller stations.
Name the 3 public radio stations?
The answer is the following: WHYY-FM (NPR), WRTI (jazz, classical), and WXPN-FM

Problem: Some large broad-winged birds rely on thermal columns of rising hot air to enable them to soar. These include many birds of prey such as vultures, eagles, and buzzards, but also storks. These birds migrate in the daytime. Migratory species in these groups have great difficulty crossing large bodies of water, since thermals only form over land, and these birds cannot maintain active flight for long distances. Mediterranean and other seas present a major obstacle to soaring birds, which must cross at the narrowest points. Massive numbers of large raptors and storks pass through areas such as the Strait of Messina, Gibraltar, Falsterbo, and the Bosphorus at migration times. More common species, such as the European honey buzzard Pernis apivorus, can be counted in hundreds of thousands in autumn. Other barriers, such as mountain ranges, can also cause funnelling, particularly of large diurnal migrants. This is a notable factor in the Central American migratory bottleneck. Batumi bottleneck in the Caucasus is one of the heaviest migratory funnels on earth. Avoiding flying over the Black Sea surface and across high mountains, hundreds of thousands of soaring birds funnel through an area around the city of Batumi, Georgia. Birds of prey such as honey buzzards which migrate using thermals lose only 10 to 20% of their weight during migration, which may explain why they forage less during migration than do smaller birds of prey with more active flight such as falcons, hawks and harriers.
What is one of the heaviest migratory funnels?
The answer is the following:
Batumi bottleneck