from two distinct cellular lineages, a separation that appears to be hardcoded into our biology from the earliest stages of embryonic development. For decades, standard developmental models assumed the brain grew from a homogenous pool of precursor...

for such massive animals, primarily due to the difficulty of maintaining stable environmental conditions for developing embryos. Comparison of eggshell porosity and egg size across dinosaurs, including titanosaurs and crocodilians. Credit: Royal Society...