In commemorating Piaget we should not remember his psychology alone. He hoped for a biologically grounded epistemology, which would require interdisciplinary effort. This paper mentions some recent research in biology, embryology, and philosophy that is consonant with Piaget's epistemological aims. The authors do not cite Piaget as a prime intellectual influence, there being no distinctive Piagetian methodology outside psychology. But they each mention him as someone whose work is relevant to theirs and whose interdisciplinary aims will be achieved only if studies like these can be integrated in the future.