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This is the VOA Special English Education Report.May first is an important date in the college admissions process in the United States. This is the last day for high school seniors to accept or reject offers of admission in the fall. Offers are sent by April fifteenth. This is the VOA Special English Health Report.Heparin is a blood-thinning medicine made from pig intestines, which often come from small farms in China. The drug is often used to prevent blockages during kidney dialysis treatment and different operations.But in February, a major producer, Baxter International, recalled almost all of its heparin. Tests showed the presence of a chemical called oversulfated chondroitin sulfate. This is chemically similar to heparin but should not have been used. Who added it, and why, remains unclear. Leroy Hubley of Toledo, Ohio, lost his wife and son after they received heparin. He is shown at a hearing held Tuesday by a House Energy and Commerce subcommittee. Officials in the United States have received hundreds of reports of severe reactions, including deaths. On April twenty-first, the Food and Drug Administration released a warning letter to a Chinese supplier for the Baxter heparin. The letter said Changzhou SPL had received material from an unacceptable supplier, and could not purify the materials used to make the drug. F.D.A. inspectors found that the company did not follow good manufacturing practice. Chinese officials have suggested that the contaminant entered the heparin during the finishing process in the United States. Baxter disagreed. A Chinese delegation visited a Baxter factory in New Jersey last week. Scientists have offered explanations for how the chemical could have caused the allergic reactions and low blood pressure seen in patients. Reports from two teams were published online last week in the New England Journal of Medicine and Nature Biotechnology. Both teams were led by Professor Ram Sasisekharan at the Massachusetts Institute of Technology. Officials in the United States are investigating eighty-one deaths in heparin patients with signs of allergic reactions or low blood pressure. Most of these deaths happened between November of last year and February of this year. But F.D.A. officials say the reactions may not have been the cause of death in all cases.China says there is no proof of a connection between the contaminant and the deaths. The chemical has been found in heparin supplies in other countries. But Chinese officials note that the United States and Germany are the only countries that have reported any health problems. The widespread use of foreign drug suppliers has led American lawmakers to call for at least five hundred additional F.D.A. inspectors. Also, a House subcommittee held a hearing Tuesday called "The Heparin Disaster: Chinese Counterfeits and American Failures." And that’s the VOA Special English Health Report written by Caty Weaver. I’m Barbara KleinAcceptance rates at the top colleges were lower than ever this year. No surprise, just more stress from stories of top students getting rejection letters even from less competitive schools.Numbers tell the story. The Education Department predicts that the number of high school graduates in the United States will reach the highest level ever this year. Three million three hundred thirty thousand students are expected to graduate. Lucas Morales, a high school senior in New Mexico, sorts through college catalogs and letters of interest at his home But not only are there more college applicants these days, they are also applying to more colleges. Online and common applications make the process easier. It can mean several acceptances to choose from. It also means more work for colleges to get the students they accept to accept them. Many colleges and universities hold visiting days that offer a chance to attend classes and stay overnight; sort of a test drive. Some schools send gifts. At least one college has its international students write letters in the native languages of accepted applicants.For many families, though, the most important thing colleges can do is show them the money. Lately, top schools with lots of money have increased their financial aid, putting pressure on other colleges to do the same.Deciding how many students to accept can be difficult. It involves trying to predict the number of applicants who will decide to attend. Students may not like being put on waiting lists, but mistakes can be costly. Some colleges have had to house new students in hotels because a larger than expected number accepted admission offers.This year, the weak economy has admissions officers nervous that some families may not be able to pay for college as planned. The recent problems that spread from the housing market to credit markets have even affected student loans.Colleges are also facing changes in the population. The Education Department expects the number of high school graduates to start going down after this year. This will happen as the last of the children of the baby boom generation finish high school.The number is not expected to start rising again until two thousand fifteen.And that's the VOA Special English Education Report, written by Nancy Steinbach. Transcripts and MP3s of our reports are at voaspecialenglish.com. I'm Steve Ember.