大象传媒

The US House of Representatives has passed a police reform bill named after George Floyd, whose killing sparked an outcry against police racism and brutality; Austria and Denmark are joining forces with Israel to produce second generation vaccines that will work against different mutations; and the contents of an unopened letter that was mailed way back in 1697 - but never delivered - has been read by scientists who have created a way to virtually "unfold" sealed letters without actually breaking the seal.