There was poetry, there were colorful signs, and there were scientists who only went into science because they read Margaret Atwood. The marches weren’t supposed to be political, but “one of the poems in Ms. Roberts’s handout,’“Advice from a Caterpillar’ by Amy Gerstler, felt like it could serve as a manual for resistance, or at least for survival. ‘Behave cryptically to confuse predators,’ it read: ‘change colors, spit, or feign death. If all else fails, taste terrible.'”