Even early graders may resent the continual schoolteacherish prodding to ""go outside and close your eyes,"" let ""your clothes flutter in the breeze"" and ""look about you."" And surely children who are about to learn the word ""disseminule"" (not to mention cotyledon, endosperm and achene) followed by a page of arithmetic on the ratio of surface area to weight needn't be told that ""heavy and bulky things like a baseball bat or a brick"" are less likely to blow away than light things. The rather technical presentation of the parts of seeds doesn't jibe with the analogies to spitting and playing tiddlywinks which are used to explain the simple phenomenon of seed expulsion -- further evidence that Rahn doesn't know exactly what age group she is talking to. Millicent Selsam's trusty Play With Seeds travels much the same route in any case and for more exotic examples of dissemination, Daniel Cohen's How Did Life Get There? (KR, p. 319, J-99) is a useful supplement.