drinking bird toy. It’s written in a fun, engaging, conversational style, as if he’s in the room chatting with you about these neat ideas. See also Perelman (crater) References External links Physics for Entertainment Free electronic edition at the Internet Archive. Figure for Fun: Stories and Conundrums Free electronic edition at the Internet Archive. Astronomy for Entertainment Biography in Spanish. 1882 births 1942 deaths Recreational mathematicians Mathematics popularizers Puzzle designers People from Białystok 19th-century Polish Jews Russian science writers Soviet non-fiction writers Jewish Russian writers Soviet male writers 20th-century Russian male writers Russian naturalists Nature writers Saint-Petersburg State Forestry University alumni 20th-century naturalists Male non-fiction writers Victims of the Siege of Leningrad Deaths by starvation