Long before their teeth evolved to handle tough, fibrous plants, early humans were already digging up and eating grasses, sedges, and starchy underground foods.A new fossil-tooth isotope study shows this behavior began about 700,000 years before longer molars emerged -- revealing that behavioral innovation, not anatomy, drove the change...As early humans moved from the dense forests of Africa into open grasslands, they began relying on quick, reliable sources of energy. This shift in habitat led them to favor grassy plants, especially grains and the starchy tissues stored underground.A new study led by Dartmouth researchers reveals that hominins started eating these...