if you met a medieval person that just time travelled to our time what is the first technology you show them?

@redredred don't they have those?

@popmol Soap requires either animal fáts or vegetable oils, both were pricy at the time and little was wasted on soap except for the wealthy. Even the ines who had it used it more for laundry than for bathing. And bathing was not that very common or frequent. Even the Romans never knew about soap.

@redredred i see :)