The FBI has released new footage showing the suspect in the killing of US activist Charlie Kirk running across a roof - from where the fatal shot was fired - before dropping to the ground and crossing a road. As the authorities continue their search, BBC Verify's Nick Beake has been looking at the footage and what we know about his escape. Watch: Key moments from RFK Jr's heated Senate hearing The US health secretary faced questions on Covid deaths and vaccines a week after firing the head of the Centers for Disease Control and Prevention. The group said they are making their own list of Jeffrey Epstein's associates and called for the release of all files related to the investigation. The molten magma streamed down one of the world's most active volcanoes and put on another fiery show on the Island of Hawaii.

What's the earliest memory you can recall? While many people's recollections of the past may stretch back into childhood, research shows that the trip down memory lane generally hits a wall once you reach infancy. In some ways, this doesn't make much sense--after all, the first years of a baby's life are when they learn foundational psychological concepts, form relationships with caregivers, and gain a sense of self. Experts have long attributed this "infant amnesia" to the development timeline of the hippocampus, the region of the brain responsible for retaining memories. But according to new evidence from a team at Yale University, the explanation for early our memory blocks may be a bit more complicated.

With countless predictions about what's in store for artificial intelligence in 2020, I'm eager to see what will come true and what will fall by the wayside. I think that one of the more paradigm-changing predictions will be moving AI's learning ability to the edge. Under the hood of AI's generic name, a variety of approaches are hidden, spanning from huge models that crunch data on a distributed cloud infrastructure to tiny, edge-friendly AI that analyze and mine data on small processors. From my academic research at Boston University to cofounding Neurala, I have always been keenly aware of the difference between these two types of AI--let's call them "heavy" and "light" AI. Heavy AI requires hefty compute substrates to run, while light AI can do what heavy AI is capable of but on smaller compute power.