The doctor Federico Olóriz narrated in his personal diary the arrival of a plague in Spain in 1884, with a unique measure of time: periods of 15 minutes.

Exploration of the Red Planet is a display of strength and an inspiration for science

Health personnel should be a priority in immunization, but there are discrepancies about which groups will follow

El propio padre de la teoría de conjuntos se dio cuenta de las paradojas derivadas de una concepción ingenua