In this week’s issue: Steve Coll on Tunisia; Ben McGrath on football’s concussion crisis; David E. Hoffman on swine flu; James Surowiecki on Hu Jintao; Elizabeth Kolbert on the tiger-mom furor; Peter J. Boyer on Roger and Elizabeth Ailes’s newspaper; Ruth Franklin on H. G. Adler; Peter Schjeldahl on New York mashups; Patricia Marx on the rage for renting; Anthony Lane on “The Way Back” and “Biutiful”; fiction by Alice Munro; and more.