Among the STEM toys in this holiday gift guide is this kit for ages 10 and up. In my day, children couldn’t isolate DNA at home, though I guess we could breed bacteria. Neither could scientists. Students learn to isolate DNA from a tomato, build a DNA model, and breed bacteria as they gain an understanding of how genetic engineering informs many biomedical- and science-related fields. They can even analyze evidence to identify suspects and solve a crime by studying genetic co