Same for gravity, two concepts, so it's -- which is quite humbling, as a, you know, if you're a teacher, and you look before and after, that's quite worrying. They do worse in tests afterwards, after the teaching.
Lo mismo con la gravedad, dos conceptos, entonces es bastante humillante, para los maestros, si miran antes y después, es bastante preocupante. Les va peor en los exámenes después de la enseñanza.