         Sentence::1: How many :days~ after  Gagarin's flight :did: the US “House  Committee: “.on Science ‘and.  Astronautics meet?    “Sentence 2::On April 12;.1961,. Soviet  cosmonaut. Yuri-.Gagarin. became  the ‘first person. to, fly-in space,  “reinforcing American: fears’“about  ‘being left behind.in. a technological.  competition with thé Soviet Union: