One of the most cherished science fiction scenarios is using a black hole as a portal to another dimension or time or universe. That fantasy may be closer to reality than previously imagined. Read more.
In a trio of letters sent Tuesday to executives at Amazon, Google, and Microsoft, a coalition of 90 civil and human rights groups called on the companies to refuse to sell facial recognition technology to governments across the globe, cautioning that such systems can endanger people and undermine public trust. Read more.