Nature, 8 p.m., PBS (check listings)
Tonight, “Why size matters in the world of whales; similarities between whales and dolphins and humans; the songs of humpbacks and sperm whales.” I love whales. Now you know.
20/20, 10 p.m., ABC
“Robin Roberts examines the early lives and careers of the 2012 Oscar nominees and showcases photos, home videos and interviews with former co-stars and friends.” Really? Is there anything about George Clooney or Meryl Streep we don’t know?
Restaurant: Impossible, 10 p.m., Food
“A dirty Italian eatery has not been cleaned in 25 years.” Am I wrong, or don’t our tax dollars pay people to inspect these places more often than once every 25 years?