Science and technology

Associated Press
FILE - This Nov. 7, 2013 file photo shows a displaced Syrian child receiving vaccination against polio at one of the Syrian refugee camps in the southern port city of Sidon, Lebanon. Polio has been wiped out of many countries thanks to massive use of oral vaccine. But new research suggests trying a one-two punch where the disease is still a threat: Giving a single vaccine shot to children who’ve already gotten the drops boosted their immunity. World Health Organization officials say the combination strategy could help finally eradicate polio. (AP Photo/Mohammed Zaatari, File)

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