TASK DEFINITION: Given a context passage, generate a question from the passage such that its answer is shortest continous span from the passage.
PROBLEM: Energy from the Sun comes from the lightest element, hydrogen, fusing together to create the second lightest element, helium. Nuclear fusion on the Sun releases tremendous amounts of solar energy. The energy travels to the Earth, mostly as visible light. The light carries the energy through the empty space between the Sun and the Earth as radiation. Solar energy has been used for power on a small scale for hundreds of years, and plants have used it for billions of years. Unlike energy from fossil fuels, which almost always come from a central power plant or refinery, solar power can be harnessed locally (Figure 1.1). A set of solar panels on a homes rooftop can be used to heat water for a swimming pool or can provide electricity to the house. Societys use of solar power on a larger scale is just starting to increase. Scientists and engineers have very active, ongoing research into new ways to harness energy from the Sun more efficiently. Because of the tremendous amount of incoming sunlight, solar power is being developed in the United States in southeastern California, Nevada, and Arizona. Solar panels supply power to the Interna- tional Space Station. Solar power plants turn sunlight into electricity using a large group of mirrors to focus sunlight on one place, called a receiver (Figure 1.2). A liquid, such as oil or water, flows through this receiver and is heated to a high temperature by the focused sunlight. The heated liquid transfers its heat to a nearby object that is at a lower temperature through a process called conduction. The energy conducted by the heated liquid is used to make electricity. This solar power plant uses mirrors to focus sunlight on the tower in the center. The sunlight heats a liquid inside the tower to a very high temperature, producing energy to make electricity. Solar energy has many benefits. It is extremely abundant, widespread, and will never run out. But there are problems with the widespread use of solar power. Sunlight must be present. Solar power is not useful in locations that are often cloudy or dark. However, storage technology is being developed. The technology needed for solar power is still expensive. An increase in interested customers will provide incentive for companies to research and develop new technologies and to figure out how to mass-produce existing technologies (Figure 1.3). Solar panels require a lot of space. Fortunately, solar panels can be placed on any rooftop to supply at least some of the power required for a home or business. This experimental car is one example of the many uses that engineers have found for solar energy. Click image to the left or use the URL below. URL: Click image to the left or use the URL below. URL:

SOLUTION: the source of solar power is nuclear

PROBLEM: The product of the multiple endocrine neoplasia type 1 (MEN1) tumor suppressor gene, menin, is an integral component of MLL1/MLL2 histone methyltransferase complexes specific for Lys4 of histone H3 (H3K4). We show that menin is a transcriptional coactivator of the nuclear receptors for estrogen and vitamin D. Activation of the endogenous estrogen-responsive TFF1 (pS2) gene results in promoter recruitment of menin and in elevated trimethylation of H3K4. Knockdown of menin reduces both activated TFF1 (pS2) transcription and H3K4 trimethylation. In addition, menin can directly interact with the estrogen receptor-alpha (ERalpha) in a hormone-dependent manner. The majority of disease-related MEN1 mutations prevent menin-ERalpha interaction. Importantly, ERalpha-interacting mutants are also defective in coactivator function. Our results indicate that menin is a critical link between recruitment of histone methyltransferase complexes and nuclear receptor-mediated transcription.

SOLUTION: Which is the histone residue methylated by MLL1?

PROBLEM: There are many Spanish gossip magazines being published around the world. If your Spanish is good enough, these magazines will offer a lively look into the private moments of the beautiful, rich and famous, and provide entertainment and at the same time, help you practice your Spanish. DiezMinutos: The magazine is a classic Spanish gossip feast with daily news based on many stories of love, separation, divorce and death. The two main parts are headlined "love"and "partners".They also have an online version of the magazine for serious gossip addicts. Hola: It is Spain's top weekly magazine and the leader of the gossip world. It contains many pictures and a round-up of well-known and less well-known nobles and people in show business. Apart from edited highlights from the present and past issues, there is a report of the week and photo of the week. There is also a French version calledOhLa! RevistaCUORE: As the third best-selling gossip magazine in Spain, it is mainly aimed at younger teenage readers who look not only for current celebrity gossip, but also for fashion and TV news. It uses a lot of oralterms. RevistaSEMANA: It is a Spanish magazine covering the latest news on the famous in Spain and Hollywood. It also offers its readers information on fashion, beauty, cooking and travel. RevistaLECTURAS: Practical, friendly and informal, this magazine is one of the most widely-read gossip magazines on the Spanish market today. Marujeo.com: It is a blog serving up a daily diet of national gossip news on Spanish and international celebrities and the celebrity world from a particular point of view. RevistaCARAS: It is a magazine published in various countries of Latin America. It is also exported to certain parts of the United States, bringing together strange and wonderful news from around the world and the famous Latin community.

SOLUTION:
How many of the magazines mentioned in the text can be read on the Internet?