Question: For example, consider electron–positron annihilation, in which the rest mass of individual particles is destroyed, but the inertia equivalent of the system of the two particles (its invariant mass) remains (since all energy is associated with mass), and this inertia and invariant mass is carried off by photons which individually are massless, but as a system retain their mass. This is a reversible process – the inverse process is called pair creation – in which the rest mass of particles is created from energy of two (or more) annihilating photons. In this system the matter (electrons and positrons) is destroyed and changed to non-matter energy (the photons). However, the total system mass and energy do not change during this interaction.
Try to answer this question if possible: What is it called when the rest mass of individual particles is destroyed but the inertia equivalent of the system of the two particles remains?
Answer: electron–positron annihilation
Question: According to Chinese state officials, the quake caused 69,180 known deaths including 68,636 in Sichuan province; 18,498 people are listed as missing, and 374,176 injured, but these figures may further increase as more reports come in.[dated info] This estimate includes 158 earthquake relief workers who were killed in landslides as they tried to repair roads.
Try to answer this question if possible: How many people were injured?
Answer: 374,176
Question: In addition, the company provides protection services, advisory services, multivendor hardware support, "how-to" support for software applications, collaborative support with many third-party vendors, and online parts and labor dispatching for customers who diagnose and troubleshoot their hardware. Dell also provides Dell ProSupport customers access to a crisis-center to handle major outages, or problems caused by natural disasters. Dell also provide on-line support by using the computer's service-tag that provides full list of the hardware elements installed originally, purchase date and provides the latest upgrades for the original hardware drivers.
Try to answer this question if possible: What kind of hardware support doesn't Dell provide?
Answer: unanswerable
Question: It is not clear exactly where collegiate a cappella began. The Rensselyrics of Rensselaer Polytechnic Institute (formerly known as the RPI Glee Club), established in 1873 is perhaps the oldest known collegiate a cappella group.[citation needed] However the longest continuously-singing group is probably The Whiffenpoofs of Yale University, which was formed in 1909 and once included Cole Porter as a member. Collegiate a cappella groups grew throughout the 20th century. Some notable historical groups formed along the way include Princeton University's Tigertones (1946), Colgate University's The Colgate 13 (1942), Dartmouth College's Aires (1946), Cornell University's Cayuga's Waiters (1949) and The Hangovers (1968), the University of Maine Maine Steiners (1958), the Columbia University Kingsmen (1949), the Jabberwocks of Brown University (1949), and the University of Rochester YellowJackets (1956). All-women a cappella groups followed shortly, frequently as a parody of the men's groups: the Smiffenpoofs of Smith College (1936), The Shwiffs of Connecticut College (The She-Whiffenpoofs, 1944), and The Chattertocks of Brown University (1951). A cappella groups exploded in popularity beginning in the 1990s, fueled in part by a change in style popularized by the Tufts University Beelzebubs and the Boston University Dear Abbeys. The new style used voices to emulate modern rock instruments, including vocal percussion/"beatboxing". Some larger universities now have multiple groups. Groups often join one another in on-campus concerts, such as the Georgetown Chimes' Cherry Tree Massacre, a 3-weekend a cappella festival held each February since 1975, where over a hundred collegiate groups have appeared, as well as International Quartet Champions The Boston Common and the contemporary commercial a cappella group Rockapella. Co-ed groups have produced many up-and-coming and major artists, including John Legend, an alumnus of the Counterparts at the University of Pennsylvania, and Sara Bareilles, an alumna of Awaken A Cappella at University of California, Los Angeles. Mira Sorvino is an alumna of the Harvard-Radcliffe Veritones of Harvard College where she had the solo on Only You by Yaz.
Try to answer this question if possible: What were The Whiffenpoofs of Yale University often a parody of?
Answer:
unanswerable