Bill Gates says 'Black lives matter' and pledges to fight 'systemic racism' in the wake of recent killings

· In a series of tweets posted Tuesday night, Microsoft co-founder Bill Gates pledged to work against "systemic racism" and said that "Black lives matter."
· "The horrifying killings of George Floyd, Ahmaud Arbery, Breonna Taylor, and far too many other Black people — and the protests they sparked — are shining a light on...