Next week is Valentine’s Day, but instead of talking about falling in love, we’re going to talk about falling cats and barrels. First, writer David Quammen tells us about a strange observation: cats are falling out of buildings in New York City. When a cat falls from less than five stories or more than nine stories, it usually survives. But when it falls from between five and nine stories, it suffers serious injury. Why? Physics has the answer. Then we meet Annie Taylor, the first person who went over Niagara falls in a barrel. For more, check out Garret Soden’s “Falling: How Our Greatest Fear Became Our Greatest Thrill.” Radiolab was created by Jad Abumrad and is edited by Soren Wheeler. Lulu Miller and Latif Nasser are our co-hosts. Dylan Keefe is our director of sound design. Our staff includes: Simon Adler, Jeremy Bloom, Becca Bressler, W. Harry Fortuna, David Gebel, Maria Paz Gutiérrez, Sindhu Gnanasambandan, Matt Kielty, Annie McEwen, Alex Neason, Valentina Powers, Sarah Qari, Sarah Sandbach, Arianne Wack, Pat Walters and Molly Webster. Our fact-checkers are Diane Kelly, Emily Krieger and Natalie Middleton. Production help from Tanya Chawla. Sound mixing by Joe Plourde.