Was the earth round in 1500? (available in Portuguese only)
Joaquim Alves Gaspar gave a Ted Talk in May under the topic of the Maritime Discoveries and shows how cartographers and seafarers dealt with the geometric inconsistencies of the early modern nautical charts. This talk was given at a TEDx event using the TED conference format but independently organized by a local community from "Universidade de Lisboa". The full talk can be accessed here.