On this edition to Africa 54, demonstrators take to the streets of Chad's capital calling for a transition to civilian rule, defying a ban on protests imposed by the military during a period of national mourning for President Idriss Deby; Two Spanish journalists and an Irish citizen are killed in an armed ambush on an anti-poaching patrol near a nature reserve in eastern Burkina Faso; This week marks 100 days of Joe Biden’s U.S. presidency.