With the arrival of the contagious Delta variant, Covid hospitalizations and deaths among vaccinated Americans also may have increased, according to preliminary figures.
The discovery suggested that horseshoe crab brains haven’t changed much and that there are more ways for soft tissues to be preserved in the fossil record.
Un nuevo estudio desafía las suposiciones que tenemos sobre el gasto de energía de las personas, entre ellas la idea de que el metabolismo se vuelve más lento en la mediana edad.